From 51e479c28768bebab41d927871ca497ad3f42bc3 Mon Sep 17 00:00:00 2001
From: Andrea Mannocci <andremann@libero.it>
Date: Tue, 30 Mar 2021 17:39:05 +0200
Subject: [PATCH] added study of education and employment

---
 notebooks/01-Exploration.ipynb | 4830 ++++++++++++++++++++++++++++++--
 1 file changed, 4539 insertions(+), 291 deletions(-)

diff --git a/notebooks/01-Exploration.ipynb b/notebooks/01-Exploration.ipynb
index ea30eb8..a807910 100644
--- a/notebooks/01-Exploration.ipynb
+++ b/notebooks/01-Exploration.ipynb
@@ -508,7 +508,7 @@
        "      <td>data scientist &amp; researcher; scholarly knowled...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>andrea.mannocci@isti.cnr.it</td>\n",
-       "      <td>[open science, data science, research infrastr...</td>\n",
+       "      <td>[open science, data science, science of scienc...</td>\n",
        "      <td>[[scopus author id, 55233589900]]</td>\n",
        "      <td>[[information engineering, ph.d., università d...</td>\n",
        "      <td>[[research associate, istituto di scienza e te...</td>\n",
@@ -549,7 +549,7 @@
        "3073261  andrea.mannocci@isti.cnr.it   \n",
        "\n",
        "                                                  keywords  \\\n",
-       "3073261  [open science, data science, research infrastr...   \n",
+       "3073261  [open science, data science, science of scienc...   \n",
        "\n",
        "                              external_ids  \\\n",
        "3073261  [[scopus author id, 55233589900]]   \n",
@@ -654,7 +654,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>NaN</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[whatsapp gb apk, whatsapp gb baixar, whatsapp...</td>\n",
+       "      <td>[whatsapp gb baixar, whatsapp gb 2020, whatsap...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
@@ -689,7 +689,7 @@
        "9887272       other    whatsapp      <NA>         NaN          <NA>   \n",
        "\n",
        "                                                  keywords external_ids  \\\n",
-       "9887272  [whatsapp gb apk, whatsapp gb baixar, whatsapp...          NaN   \n",
+       "9887272  [whatsapp gb baixar, whatsapp gb 2020, whatsap...          NaN   \n",
        "\n",
        "        education employment  n_works works_source           activation_date  \\\n",
        "9887272       NaN        NaN        0          NaN  2020-10-07t10:37:12.237z   \n",
@@ -778,7 +778,7 @@
       "text/plain": [
        "count                10989649\n",
        "unique               10989649\n",
-       "top       0000-0002-6749-5031\n",
+       "top       0000-0001-5242-3687\n",
        "freq                        1\n",
        "Name: orcid, dtype: object"
       ]
@@ -807,10 +807,10 @@
     {
      "data": {
       "text/plain": [
-       "count               124722\n",
-       "unique              124718\n",
-       "top       maykin@owasp.org\n",
-       "freq                     2\n",
+       "count                     124722\n",
+       "unique                    124718\n",
+       "top       opercin@erbakan.edu.tr\n",
+       "freq                           2\n",
        "Name: primary_email, dtype: object"
       ]
      },
@@ -1263,7 +1263,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>NaN</td>\n",
        "      <td>patrick.davey@monash.edu</td>\n",
-       "      <td>[radiochemistry, radiopharmaceuticals, bioinor...</td>\n",
+       "      <td>[radiochemistry, inorganic chemistry, bioinorg...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[phd student, monash university, melbourne, ,...</td>\n",
@@ -1337,7 +1337,7 @@
        "5590332  patrick.davey@monash.edu   \n",
        "\n",
        "                                                  keywords external_ids  \\\n",
-       "954085   [radiochemistry, radiopharmaceuticals, bioinor...          NaN   \n",
+       "954085   [radiochemistry, inorganic chemistry, bioinorg...          NaN   \n",
        "5590332                                                NaN          NaN   \n",
        "\n",
        "        education                                         employment  n_works  \\\n",
@@ -2413,9 +2413,9 @@
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       },
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@@ -7981,7 +7981,7 @@
        "      <td>abdul aziz was born on may 25, 1973, in brebes...</td>\n",
        "      <td>[abdul aziz, aziz, abdul, aziz, a., aziz, abd,...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[metodologi penelitian, etika bisnis islam, il...</td>\n",
+       "      <td>[metodologi penelitian, ilmu ekonomi, ekonomi ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[ilmu ekonomi, dr, universitas borobudur, jak...</td>\n",
        "      <td>[[assisten professor/dr, institut agama islam ...</td>\n",
@@ -7993,7 +7993,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>77</td>\n",
-       "      <td>True</td>\n",
+       "      <td>False</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[google.com, syekhnurjati.ac.id, orcid.org, bl...</td>\n",
@@ -8014,7 +8014,7 @@
        "      <td>professor of electronics and communications en...</td>\n",
        "      <td>[r.romaniuk, r.s.romaniuk, ryszard romaniuk, r...</td>\n",
        "      <td>rrom@ise.pw.edu.pl</td>\n",
-       "      <td>[electronics, telecommunications, photonics, m...</td>\n",
+       "      <td>[electronics, measurement systems, research sy...</td>\n",
        "      <td>[[isni, 0000000071432485], [researcherid, b-91...</td>\n",
        "      <td>[[faculty of electronics and information techn...</td>\n",
        "      <td>[[professor, institute director, politechnika ...</td>\n",
@@ -8047,7 +8047,7 @@
        "      <td>professor eduard babulak is accomplished inter...</td>\n",
        "      <td>[professor eduard babulak]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[smart computational devices, quality of servi...</td>\n",
+       "      <td>[quality of service provision assessment, next...</td>\n",
        "      <td>[[scopus author id, 6506867432], [researcherid...</td>\n",
        "      <td>[[information technology, doctor habilitated (...</td>\n",
        "      <td>[[consultant, horizon 2020 framework programme...</td>\n",
@@ -8080,7 +8080,7 @@
        "      <td>surname, name gusev  alexander leonidovichdate...</td>\n",
        "      <td>[alexander l. gusev , alexander leonidovich gu...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[technologies of production, energy, materials...</td>\n",
+       "      <td>[technologies of production, technologies of i...</td>\n",
        "      <td>[[researcherid, f-8048-2014], [scopus author i...</td>\n",
        "      <td>[[chemical technology and cryogenic-vacuum tec...</td>\n",
        "      <td>[[general director, scientific technical centr...</td>\n",
@@ -8092,7 +8092,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>21</td>\n",
-       "      <td>True</td>\n",
+       "      <td>False</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[youtube.com, isjaee.com, researchgate.net, re...</td>\n",
@@ -8146,7 +8146,7 @@
        "      <td>gustavo norberto duperré graduated in arts and...</td>\n",
        "      <td>[gustavo norberto duperré, duperré, g. n., gus...</td>\n",
        "      <td>gustavo.duperre@usal.edu.ar</td>\n",
-       "      <td>[medieval and modern history, social sciences,...</td>\n",
+       "      <td>[computer science, sciences of antiquity, cont...</td>\n",
        "      <td>[[scopus author id, 57195936346], [researcheri...</td>\n",
        "      <td>[[programme in history, history of art and ter...</td>\n",
        "      <td>[[titular professor, dirección general de cult...</td>\n",
@@ -8179,7 +8179,7 @@
        "      <td>pós-doutorado em gestão ambiental pela univers...</td>\n",
        "      <td>[ munhoz, pelayo olea,  olea, pelayo,  olea, p...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[inovação, empreendedorismo, sustentabilidade]</td>\n",
+       "      <td>[empreendedorismo, sustentabilidade, inovação]</td>\n",
        "      <td>[[scopus author id, 55175503300], [researcheri...</td>\n",
        "      <td>[[, postdoctoral in environmental sustainabili...</td>\n",
        "      <td>[[professor, universidade federal do rio grand...</td>\n",
@@ -8224,7 +8224,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>16</td>\n",
-       "      <td>True</td>\n",
+       "      <td>False</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[researchgate.net, youtube.com, linkedin.com, ...</td>\n",
@@ -8245,7 +8245,7 @@
        "      <td>we procure and deliver premium cannabis strain...</td>\n",
        "      <td>[we procure and deliver premium cannabis strai...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[cannabis community, cannabis, marijuana, mari...</td>\n",
+       "      <td>[marijuana dispensary, cannabis, canabis dispe...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
@@ -8278,7 +8278,7 @@
        "      <td>jaroslaw spychala has received a doctoral degr...</td>\n",
        "      <td>[jaroslaw jozef spychala]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[organic chemistry, photochemistry, biochemist...</td>\n",
+       "      <td>[photochemistry, medicinal and pharmaceutical ...</td>\n",
        "      <td>[[scopus author id, 7006745874]]</td>\n",
        "      <td>[[department of chemistry, postdoctoral associ...</td>\n",
        "      <td>[[assistant professor, adam mickiewicz univers...</td>\n",
@@ -8344,7 +8344,7 @@
        "      <td>dr. parameshachari b dacm distinguished speake...</td>\n",
        "      <td>[dr. parameshachari b d]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[secretary|ieee circuits and systems (cas) soc...</td>\n",
+       "      <td>[mysore region coordinator|ieee bangalore sect...</td>\n",
        "      <td>[[researcherid, f-7045-2018], [scopus author i...</td>\n",
        "      <td>[[electronics and communication engineering, p...</td>\n",
        "      <td>[[acm distinguished speaker (volunteer), assoc...</td>\n",
@@ -8356,7 +8356,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>48</td>\n",
-       "      <td>True</td>\n",
+       "      <td>False</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[geethashishu.in, geethashishu.in, acm.org, go...</td>\n",
@@ -8377,7 +8377,7 @@
        "      <td>all my papers can be downloaded from portal:re...</td>\n",
        "      <td>[jaelani, a., jaelani, aan]</td>\n",
        "      <td>aan_jaelani@syekhnurjati.ac.id</td>\n",
-       "      <td>[public finance &amp; budgeting, energy economics,...</td>\n",
+       "      <td>[islamic economics, islamic finance and bankin...</td>\n",
        "      <td>[[scopus author id, 57195963463], [loop profil...</td>\n",
        "      <td>[[post graduate, s3/dr, universitas islam nege...</td>\n",
        "      <td>[[dr, institut agama islam negeri syekh nurjat...</td>\n",
@@ -8481,19 +8481,19 @@
        "10652632  aan_jaelani@syekhnurjati.ac.id   \n",
        "\n",
        "                                                   keywords  \\\n",
-       "1025713   [metodologi penelitian, etika bisnis islam, il...   \n",
-       "2743648   [electronics, telecommunications, photonics, m...   \n",
-       "3011724   [smart computational devices, quality of servi...   \n",
-       "3881064   [technologies of production, energy, materials...   \n",
+       "1025713   [metodologi penelitian, ilmu ekonomi, ekonomi ...   \n",
+       "2743648   [electronics, measurement systems, research sy...   \n",
+       "3011724   [quality of service provision assessment, next...   \n",
+       "3881064   [technologies of production, technologies of i...   \n",
        "7466062   [filosofía; educación; políticas de desarrollo...   \n",
-       "7517096   [medieval and modern history, social sciences,...   \n",
-       "8068275      [inovação, empreendedorismo, sustentabilidade]   \n",
+       "7517096   [computer science, sciences of antiquity, cont...   \n",
+       "8068275      [empreendedorismo, sustentabilidade, inovação]   \n",
        "8184260                                                 NaN   \n",
-       "8791256   [cannabis community, cannabis, marijuana, mari...   \n",
-       "10174509  [organic chemistry, photochemistry, biochemist...   \n",
+       "8791256   [marijuana dispensary, cannabis, canabis dispe...   \n",
+       "10174509  [photochemistry, medicinal and pharmaceutical ...   \n",
        "10257808  [filosofia medicina arquitectura economía dere...   \n",
-       "10486212  [secretary|ieee circuits and systems (cas) soc...   \n",
-       "10652632  [public finance & budgeting, energy economics,...   \n",
+       "10486212  [mysore region coordinator|ieee bangalore sect...   \n",
+       "10652632  [islamic economics, islamic finance and bankin...   \n",
        "\n",
        "                                               external_ids  \\\n",
        "1025713                                                 NaN   \n",
@@ -8571,18 +8571,18 @@
        "10652632  2016-03-02t18:37:44.989z  2021-03-19t10:11:57.908z     88        0   \n",
        "\n",
        "          n_pmc  n_other_pids  label primary_email_domain  \\\n",
-       "1025713       0            77   True                  NaN   \n",
+       "1025713       0            77  False                  NaN   \n",
        "2743648       0          1742   True        ise.pw.edu.pl   \n",
        "3011724       1           174  False                  NaN   \n",
-       "3881064       0            21   True                  NaN   \n",
+       "3881064       0            21  False                  NaN   \n",
        "7466062       0            34   True          hotmail.com   \n",
        "7517096       0            34  False          usal.edu.ar   \n",
        "8068275       1           582   True                  NaN   \n",
-       "8184260       0            16   True                  NaN   \n",
+       "8184260       0            16  False                  NaN   \n",
        "8791256       0             0  False                  NaN   \n",
        "10174509      0            29   True                  NaN   \n",
        "10257808      0             7  False                  NaN   \n",
-       "10486212      0            48   True                  NaN   \n",
+       "10486212      0            48  False                  NaN   \n",
        "10652632      0           193   True   syekhnurjati.ac.id   \n",
        "\n",
        "                                        other_email_domains  \\\n",
@@ -8723,7 +8723,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>0</td>\n",
-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[khntusg.com.ua, khntusg.com.ua, google.com.ua...</td>\n",
@@ -8756,7 +8756,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>3</td>\n",
-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[google.com, ristekdikti.go.id, unsyiah.ac.id,...</td>\n",
@@ -8777,7 +8777,7 @@
        "      <td>im individual inventor, and this is my work; s...</td>\n",
        "      <td>[retrodynamic, novelinflow]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[energy, imploturbocompressor, power, mechanic...</td>\n",
+       "      <td>[energy, technology, gearturbine, imploturboco...</td>\n",
        "      <td>[[loop profile, 394457]]</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
@@ -8789,7 +8789,7 @@
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-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[blogspot.mx, behance.net, authorstream.com, d...</td>\n",
@@ -8810,7 +8810,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>[nuria h. león, nuria hernández león, hernánde...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[marketing, research, icts, training, business...</td>\n",
+       "      <td>[training, icts, business management, research...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[, course: social skills, university of salam...</td>\n",
        "      <td>[[merchandise reception and expedition trainer...</td>\n",
@@ -8822,7 +8822,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>4</td>\n",
-       "      <td>True</td>\n",
+       "      <td>False</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[feriaempresamujer.com, escueladenegociosydire...</td>\n",
@@ -8843,7 +8843,7 @@
        "      <td>born in penang, malaysia in 1971, dr. mohd had...</td>\n",
        "      <td>[ndum (national defence university of malaysia)]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[wsn, network communication, network managemen...</td>\n",
+       "      <td>[wsn, manet, simulation and modelling, network...</td>\n",
        "      <td>[[scopus author id, 24372977800], [researcheri...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[lecturer, universiti pertahanan nasional mal...</td>\n",
@@ -8909,7 +8909,7 @@
        "      <td>systematics, evolutionary biology, and the his...</td>\n",
        "      <td>[r. o’hara, r.j. o’hara, robert o’hara, robert...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[history and philosophy of science, ancient nu...</td>\n",
+       "      <td>[history and philosophy of science, evolutiona...</td>\n",
        "      <td>[[isni, 0000000138200102], [researcherid, b-47...</td>\n",
        "      <td>[[biology, ph.d., harvard university, cambridg...</td>\n",
        "      <td>NaN</td>\n",
@@ -8942,7 +8942,7 @@
        "      <td>prof. dr. shagufta perveen is a professor at k...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>shagufta792000@yahoo.com</td>\n",
-       "      <td>[shagufta perveen king saud university, shaguf...</td>\n",
+       "      <td>[shagufta perveen professor, shagufta perveen ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[hej research institute of chemistry, phd che...</td>\n",
        "      <td>[[professor, king saud university college of p...</td>\n",
@@ -8975,7 +8975,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>[s. bastani, سوسن باستانی]</td>\n",
        "      <td>sbastani@alzahra.ac.ir</td>\n",
-       "      <td>[online and offline communities, social networ...</td>\n",
+       "      <td>[social networks, fuzzy logic, online and offl...</td>\n",
        "      <td>[[scopus author id, 16642098400]]</td>\n",
        "      <td>[[sociology, ph.d., university of toronto, tor...</td>\n",
        "      <td>[[professor, alzahra university, tehran, vanak...</td>\n",
@@ -9008,7 +9008,7 @@
        "      <td>caroline holds a phd in economics from curtin ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[development economics, applied economics, app...</td>\n",
+       "      <td>[development economics, applied econometrics, ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[economics, doctor of philosophy , curtin uni...</td>\n",
        "      <td>[[director, educational development, strathmor...</td>\n",
@@ -9138,14 +9138,14 @@
        "                                                   keywords  \\\n",
        "47439                   [diagnostics, transport, logistics]   \n",
        "72557                                                   NaN   \n",
-       "94081     [energy, imploturbocompressor, power, mechanic...   \n",
-       "261673    [marketing, research, icts, training, business...   \n",
-       "326211    [wsn, network communication, network managemen...   \n",
+       "94081     [energy, technology, gearturbine, imploturboco...   \n",
+       "261673    [training, icts, business management, research...   \n",
+       "326211    [wsn, manet, simulation and modelling, network...   \n",
        "...                                                     ...   \n",
-       "10579801  [history and philosophy of science, ancient nu...   \n",
-       "10590882  [shagufta perveen king saud university, shaguf...   \n",
-       "10766062  [online and offline communities, social networ...   \n",
-       "10807839  [development economics, applied economics, app...   \n",
+       "10579801  [history and philosophy of science, evolutiona...   \n",
+       "10590882  [shagufta perveen professor, shagufta perveen ...   \n",
+       "10766062  [social networks, fuzzy logic, online and offl...   \n",
+       "10807839  [development economics, applied econometrics, ...   \n",
        "10911966                                 [economic geology]   \n",
        "\n",
        "                                               external_ids  \\\n",
@@ -9214,10 +9214,10 @@
        "10911966  2021-01-26t14:36:47.421z      1        0      0             2   \n",
        "\n",
        "          label primary_email_domain     other_email_domains  \\\n",
-       "47439      True                  NaN                     NaN   \n",
-       "72557      True                  NaN                     NaN   \n",
-       "94081      True                  NaN                     NaN   \n",
-       "261673     True                  NaN                     NaN   \n",
+       "47439     False                  NaN                     NaN   \n",
+       "72557     False                  NaN                     NaN   \n",
+       "94081     False                  NaN                     NaN   \n",
+       "261673    False                  NaN                     NaN   \n",
        "326211     True                  NaN                     NaN   \n",
        "...         ...                  ...                     ...   \n",
        "10579801   True                  NaN                     NaN   \n",
@@ -9347,7 +9347,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
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-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[khntusg.com.ua, khntusg.com.ua, google.com.ua...</td>\n",
@@ -9380,7 +9380,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>3</td>\n",
-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[google.com, ristekdikti.go.id, unsyiah.ac.id,...</td>\n",
@@ -9401,7 +9401,7 @@
        "      <td>im individual inventor, and this is my work; s...</td>\n",
        "      <td>[retrodynamic, novelinflow]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[energy, imploturbocompressor, power, mechanic...</td>\n",
+       "      <td>[energy, technology, gearturbine, imploturboco...</td>\n",
        "      <td>[[loop profile, 394457]]</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
@@ -9413,7 +9413,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
        "      <td>0</td>\n",
-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[blogspot.mx, behance.net, authorstream.com, d...</td>\n",
@@ -9434,7 +9434,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>[nuria h. león, nuria hernández león, hernánde...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[marketing, research, icts, training, business...</td>\n",
+       "      <td>[training, icts, business management, research...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[, course: social skills, university of salam...</td>\n",
        "      <td>[[merchandise reception and expedition trainer...</td>\n",
@@ -9446,7 +9446,7 @@
        "      <td>0</td>\n",
        "      <td>0</td>\n",
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-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>[feriaempresamujer.com, escueladenegociosydire...</td>\n",
@@ -9467,7 +9467,7 @@
        "      <td>born in penang, malaysia in 1971, dr. mohd had...</td>\n",
        "      <td>[ndum (national defence university of malaysia)]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[wsn, network communication, network managemen...</td>\n",
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        "      <td>[[scopus author id, 24372977800], [researcheri...</td>\n",
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@@ -9533,7 +9533,7 @@
        "      <td>systematics, evolutionary biology, and the his...</td>\n",
        "      <td>[r. o’hara, r.j. o’hara, robert o’hara, robert...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[history and philosophy of science, ancient nu...</td>\n",
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        "      <td>[[isni, 0000000138200102], [researcherid, b-47...</td>\n",
        "      <td>[[biology, ph.d., harvard university, cambridg...</td>\n",
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@@ -9566,7 +9566,7 @@
        "      <td>prof. dr. shagufta perveen is a professor at k...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>shagufta792000@yahoo.com</td>\n",
-       "      <td>[shagufta perveen king saud university, shaguf...</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>[[hej research institute of chemistry, phd che...</td>\n",
        "      <td>[[professor, king saud university college of p...</td>\n",
@@ -9599,7 +9599,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>[s. bastani, سوسن باستانی]</td>\n",
        "      <td>sbastani@alzahra.ac.ir</td>\n",
-       "      <td>[online and offline communities, social networ...</td>\n",
+       "      <td>[social networks, fuzzy logic, online and offl...</td>\n",
        "      <td>[[scopus author id, 16642098400]]</td>\n",
        "      <td>[[sociology, ph.d., university of toronto, tor...</td>\n",
        "      <td>[[professor, alzahra university, tehran, vanak...</td>\n",
@@ -9632,7 +9632,7 @@
        "      <td>caroline holds a phd in economics from curtin ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[development economics, applied economics, app...</td>\n",
+       "      <td>[development economics, applied econometrics, ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[economics, doctor of philosophy , curtin uni...</td>\n",
        "      <td>[[director, educational development, strathmor...</td>\n",
@@ -9762,14 +9762,14 @@
        "                                              keywords  \\\n",
        "0                  [diagnostics, transport, logistics]   \n",
        "1                                                  NaN   \n",
-       "2    [energy, imploturbocompressor, power, mechanic...   \n",
-       "3    [marketing, research, icts, training, business...   \n",
-       "4    [wsn, network communication, network managemen...   \n",
+       "2    [energy, technology, gearturbine, imploturboco...   \n",
+       "3    [training, icts, business management, research...   \n",
+       "4    [wsn, manet, simulation and modelling, network...   \n",
        "..                                                 ...   \n",
-       "135  [history and philosophy of science, ancient nu...   \n",
-       "136  [shagufta perveen king saud university, shaguf...   \n",
-       "137  [online and offline communities, social networ...   \n",
-       "138  [development economics, applied economics, app...   \n",
+       "135  [history and philosophy of science, evolutiona...   \n",
+       "136  [shagufta perveen professor, shagufta perveen ...   \n",
+       "137  [social networks, fuzzy logic, online and offl...   \n",
+       "138  [development economics, applied econometrics, ...   \n",
        "139                                 [economic geology]   \n",
        "\n",
        "                                          external_ids  \\\n",
@@ -9825,10 +9825,10 @@
        "139           myo kyaw hlaing  2018-12-26t12:51:57.801z   \n",
        "\n",
        "             last_update_date  n_doi  n_arxiv  n_pmc  n_other_pids  label  \\\n",
-       "0    2021-03-22t13:56:48.311z      0        0      0             0   True   \n",
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-       "3    2021-03-05t16:37:47.403z      1        0      0             4   True   \n",
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        "4    2020-10-20t06:55:55.051z     24        0      0            35   True   \n",
        "..                        ...    ...      ...    ...           ...    ...   \n",
        "135  2020-07-09t06:51:09.228z     23        0      0            72   True   \n",
@@ -9972,7 +9972,7 @@
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        "      <td>NaN</td>\n",
        "      <td>[khntusg.com.ua, khntusg.com.ua, google.com.ua...</td>\n",
@@ -10005,7 +10005,7 @@
        "      <td>0</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[google.com, ristekdikti.go.id, unsyiah.ac.id,...</td>\n",
@@ -10026,7 +10026,7 @@
        "      <td>im individual inventor, and this is my work; s...</td>\n",
        "      <td>[retrodynamic, novelinflow]</td>\n",
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-       "      <td>[energy, imploturbocompressor, power, mechanic...</td>\n",
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        "      <td>[[loop profile, 394457]]</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
@@ -10038,7 +10038,7 @@
        "      <td>0</td>\n",
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-       "      <td>True</td>\n",
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        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[blogspot.mx, behance.net, authorstream.com, d...</td>\n",
@@ -10059,7 +10059,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>[nuria h. león, nuria hernández león, hernánde...</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[marketing, research, icts, training, business...</td>\n",
+       "      <td>[training, icts, business management, research...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[, course: social skills, university of salam...</td>\n",
        "      <td>[[merchandise reception and expedition trainer...</td>\n",
@@ -10071,7 +10071,7 @@
        "      <td>0</td>\n",
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@@ -10092,7 +10092,7 @@
        "      <td>clara sarmento holds an aggregation in cultura...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[feminist and gender studies, tourism and busi...</td>\n",
+       "      <td>[portuguese culture and literature, cultural a...</td>\n",
        "      <td>[[ciência id, d418-d6f8-7d49]]</td>\n",
        "      <td>[[ao abrigo da bolsa santander ie best practic...</td>\n",
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        "      <td>saifullahahmedku@gmail.com</td>\n",
-       "      <td>[posthumanism, postmodern literature, post-tru...</td>\n",
+       "      <td>[south asian literature, postmodern literature...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>[[english discipline , ma &amp; ba in english , kh...</td>\n",
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@@ -10224,7 +10224,7 @@
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        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[development economics, applied economics, app...</td>\n",
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        "      <td>[[economics, doctor of philosophy , curtin uni...</td>\n",
        "      <td>[[director, educational development, strathmor...</td>\n",
@@ -10387,14 +10387,14 @@
        "                                              keywords  \\\n",
        "0                  [diagnostics, transport, logistics]   \n",
        "1                                                  NaN   \n",
-       "2    [energy, imploturbocompressor, power, mechanic...   \n",
-       "3    [marketing, research, icts, training, business...   \n",
-       "5    [feminist and gender studies, tourism and busi...   \n",
+       "2    [energy, technology, gearturbine, imploturboco...   \n",
+       "3    [training, icts, business management, research...   \n",
+       "5    [portuguese culture and literature, cultural a...   \n",
        "..                                                 ...   \n",
-       "133  [posthumanism, postmodern literature, post-tru...   \n",
+       "133  [south asian literature, postmodern literature...   \n",
        "134                                                NaN   \n",
-       "135  [history and philosophy of science, ancient nu...   \n",
-       "138  [development economics, applied economics, app...   \n",
+       "135  [history and philosophy of science, evolutiona...   \n",
+       "138  [development economics, applied econometrics, ...   \n",
        "139                                 [economic geology]   \n",
        "\n",
        "                                          external_ids  \\\n",
@@ -10450,10 +10450,10 @@
        "139           myo kyaw hlaing  2018-12-26t12:51:57.801z   \n",
        "\n",
        "             last_update_date  n_doi  n_arxiv  n_pmc  n_other_pids  label  \\\n",
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-       "2    2021-02-09t04:56:35.554z      0        0      0             0   True   \n",
-       "3    2021-03-05t16:37:47.403z      1        0      0             4   True   \n",
+       "0    2021-03-22t13:56:48.311z      0        0      0             0  False   \n",
+       "1    2019-08-19t15:52:47.253z      3        0      0             3  False   \n",
+       "2    2021-02-09t04:56:35.554z      0        0      0             0  False   \n",
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        "5    2020-10-12t14:43:00.749z     17        0      0            60   True   \n",
        "..                        ...    ...      ...    ...           ...    ...   \n",
        "133  2021-02-12t20:45:32.247z      2        0      0             3  False   \n",
@@ -11480,9 +11480,9 @@
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        "                            \n",
-       "var gd = document.getElementById('c394ffc1-9034-4488-9fb1-d9553de350af');\n",
+       "var gd = document.getElementById('9d0f786e-e053-4f98-9a2e-f00910c2b72f');\n",
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@@ -15535,34 +15535,1170 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 57,
+   "execution_count": 120,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "count    1.753340e+06\n",
+       "mean     1.913072e+00\n",
+       "std      1.197388e+00\n",
+       "min      1.000000e+00\n",
+       "25%      1.000000e+00\n",
+       "50%      2.000000e+00\n",
+       "75%      3.000000e+00\n",
+       "max      2.000000e+02\n",
+       "Name: n_education, dtype: float64"
+      ]
+     },
+     "execution_count": 120,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "def extract_education(lst):\n",
-    "    educations = []\n",
-    "    for e in lst:\n",
-    "        # e[0] degree\n",
-    "        # e[1] role\n",
-    "        # e[2] university\n",
-    "        # e[..] city, region, country, id, id_scheme\n",
-    "        educations.append(' '.join([e[0], e[1], e[2]]))\n",
-    "    return educations"
+    "df.n_education.describe()"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 121,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
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+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>verified_email</th>\n",
+       "      <th>verified_primary_email</th>\n",
+       "      <th>given_names</th>\n",
+       "      <th>family_name</th>\n",
+       "      <th>biography</th>\n",
+       "      <th>other_names</th>\n",
+       "      <th>primary_email</th>\n",
+       "      <th>keywords</th>\n",
+       "      <th>external_ids</th>\n",
+       "      <th>education</th>\n",
+       "      <th>employment</th>\n",
+       "      <th>n_works</th>\n",
+       "      <th>works_source</th>\n",
+       "      <th>activation_date</th>\n",
+       "      <th>last_update_date</th>\n",
+       "      <th>n_doi</th>\n",
+       "      <th>n_arxiv</th>\n",
+       "      <th>n_pmc</th>\n",
+       "      <th>n_other_pids</th>\n",
+       "      <th>label</th>\n",
+       "      <th>primary_email_domain</th>\n",
+       "      <th>other_email_domains</th>\n",
+       "      <th>url_domains</th>\n",
+       "      <th>n_emails</th>\n",
+       "      <th>n_urls</th>\n",
+       "      <th>n_ids</th>\n",
+       "      <th>n_keywords</th>\n",
+       "      <th>n_education</th>\n",
+       "      <th>n_employment</th>\n",
+       "      <th>ext_works_source</th>\n",
+       "      <th>n_ext_work_source</th>\n",
+       "      <th>authoritative</th>\n",
+       "      <th>spam_score</th>\n",
+       "      <th>n_valid_employment</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>2568539</th>\n",
+       "      <td>0000-0002-1927-0292</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>phd. carmen m</td>\n",
+       "      <td>galvez-sánchez</td>\n",
+       "      <td>my name is carmen maria galvez sánchez. i´m a ...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[qualitative research, fibromyalgia, quantitat...</td>\n",
+       "      <td>[[loop profile, 509331], [scopus author id, 57...</td>\n",
+       "      <td>[[psychology, 2019-2020 course. degree in psyc...</td>\n",
+       "      <td>[[researcher and teaching staff. postdoctoral ...</td>\n",
+       "      <td>35</td>\n",
+       "      <td>[phd. carmen m galvez-sánchez, multidisciplina...</td>\n",
+       "      <td>2016-04-18t14:28:57.237z</td>\n",
+       "      <td>2021-03-06t14:17:33.246z</td>\n",
+       "      <td>24</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>7</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>5</td>\n",
+       "      <td>200</td>\n",
+       "      <td>3</td>\n",
+       "      <td>[multidisciplinary digital publishing institut...</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>0.999948</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  verified_email  verified_primary_email  \\\n",
+       "2568539  0000-0002-1927-0292            True                    True   \n",
+       "\n",
+       "           given_names     family_name  \\\n",
+       "2568539  phd. carmen m  galvez-sánchez   \n",
+       "\n",
+       "                                                 biography other_names  \\\n",
+       "2568539  my name is carmen maria galvez sánchez. i´m a ...         NaN   \n",
+       "\n",
+       "        primary_email                                           keywords  \\\n",
+       "2568539          <NA>  [qualitative research, fibromyalgia, quantitat...   \n",
+       "\n",
+       "                                              external_ids  \\\n",
+       "2568539  [[loop profile, 509331], [scopus author id, 57...   \n",
+       "\n",
+       "                                                 education  \\\n",
+       "2568539  [[psychology, 2019-2020 course. degree in psyc...   \n",
+       "\n",
+       "                                                employment  n_works  \\\n",
+       "2568539  [[researcher and teaching staff. postdoctoral ...       35   \n",
+       "\n",
+       "                                              works_source  \\\n",
+       "2568539  [phd. carmen m galvez-sánchez, multidisciplina...   \n",
+       "\n",
+       "                  activation_date          last_update_date  n_doi  n_arxiv  \\\n",
+       "2568539  2016-04-18t14:28:57.237z  2021-03-06t14:17:33.246z     24        0   \n",
+       "\n",
+       "         n_pmc  n_other_pids  label primary_email_domain other_email_domains  \\\n",
+       "2568539      0             7   True                  NaN                 NaN   \n",
+       "\n",
+       "        url_domains  n_emails  n_urls  n_ids  n_keywords  n_education  \\\n",
+       "2568539         NaN      <NA>    <NA>      2           5          200   \n",
+       "\n",
+       "         n_employment                                   ext_works_source  \\\n",
+       "2568539             3  [multidisciplinary digital publishing institut...   \n",
+       "\n",
+       "         n_ext_work_source authoritative  spam_score  n_valid_employment  \n",
+       "2568539                4.0          True    0.999948                   1  "
+      ]
+     },
+     "execution_count": 121,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "df[df.n_education == df.n_education.max()]"
+   ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 57,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
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+       "</style>\n",
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+       "      <th>education</th>\n",
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+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>28</th>\n",
+       "      <td>0000-0002-2343-910X</td>\n",
+       "      <td>[aeronautics and astronautics, phd, massachuse...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>28</th>\n",
+       "      <td>0000-0002-2343-910X</td>\n",
+       "      <td>[aeronautics and astronautics, sm, massachuset...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>28</th>\n",
+       "      <td>0000-0002-2343-910X</td>\n",
+       "      <td>[mechanical engineering and material science, ...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>29</th>\n",
+       "      <td>0000-0002-2638-4108</td>\n",
+       "      <td>[public law, ph doctor, university of oviedo, ...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>46</th>\n",
+       "      <td>0000-0003-1435-6545</td>\n",
+       "      <td>[morfologia, , universidade estadual paulista ...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10989644</th>\n",
+       "      <td>0000-0002-1686-1935</td>\n",
+       "      <td>[, , south china agricultural university, guan...</td>\n",
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+       "      <th>10989645</th>\n",
+       "      <td>0000-0002-3800-6331</td>\n",
+       "      <td>[richard gilder graduate school, phd in compar...</td>\n",
+       "    </tr>\n",
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+       "      <td>0000-0002-3800-6331</td>\n",
+       "      <td>[geological sciences and history (dual major),...</td>\n",
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+       "      <th>10989647</th>\n",
+       "      <td>0000-0002-7584-2283</td>\n",
+       "      <td>[school of electronics and information, master...</td>\n",
+       "    </tr>\n",
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+       "      <th>10989647</th>\n",
+       "      <td>0000-0002-7584-2283</td>\n",
+       "      <td>[ department of electrical engineering, bachel...</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>4434439 rows × 2 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                        orcid  \\\n",
+       "28        0000-0002-2343-910X   \n",
+       "28        0000-0002-2343-910X   \n",
+       "28        0000-0002-2343-910X   \n",
+       "29        0000-0002-2638-4108   \n",
+       "46        0000-0003-1435-6545   \n",
+       "...                       ...   \n",
+       "10989644  0000-0002-1686-1935   \n",
+       "10989645  0000-0002-3800-6331   \n",
+       "10989645  0000-0002-3800-6331   \n",
+       "10989647  0000-0002-7584-2283   \n",
+       "10989647  0000-0002-7584-2283   \n",
+       "\n",
+       "                                                  education  \n",
+       "28        [aeronautics and astronautics, phd, massachuse...  \n",
+       "28        [aeronautics and astronautics, sm, massachuset...  \n",
+       "28        [mechanical engineering and material science, ...  \n",
+       "29        [public law, ph doctor, university of oviedo, ...  \n",
+       "46        [morfologia, , universidade estadual paulista ...  \n",
+       "...                                                     ...  \n",
+       "10989644  [, , south china agricultural university, guan...  \n",
+       "10989645  [richard gilder graduate school, phd in compar...  \n",
+       "10989645  [geological sciences and history (dual major),...  \n",
+       "10989647  [school of electronics and information, master...  \n",
+       "10989647  [ department of electrical engineering, bachel...  \n",
+       "\n",
+       "[4434439 rows x 2 columns]"
+      ]
+     },
+     "execution_count": 57,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "exploded_education = df[['orcid', 'education']].explode('education').dropna()\n",
+    "exploded_education"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 58,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "exploded_education[['degree', 'role', 'university', 'city', 'region', 'country', 'id', 'id_scheme']] = pd.DataFrame(exploded_education.education.tolist(), index=exploded_education.index)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 130,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "exploded_education.id.replace('', pd.NA, inplace=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 132,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
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+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
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+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>id</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>0000-0001-5000-0162</td>\n",
+       "      <td>3</td>\n",
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+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>0000-0001-5000-0170</td>\n",
+       "      <td>2</td>\n",
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+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>0000-0001-5000-0218</td>\n",
+       "      <td>3</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>0000-0001-5000-0226</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>0000-0001-5000-0306</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
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+       "    <tr>\n",
+       "      <th>2441640</th>\n",
+       "      <td>0000-0003-4999-9719</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2441641</th>\n",
+       "      <td>0000-0003-4999-9735</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2441642</th>\n",
+       "      <td>0000-0003-4999-992X</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2441643</th>\n",
+       "      <td>0000-0003-4999-9938</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2441644</th>\n",
+       "      <td>0000-0003-4999-9954</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>2441645 rows × 2 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  id\n",
+       "0        0000-0001-5000-0162   3\n",
+       "1        0000-0001-5000-0170   2\n",
+       "2        0000-0001-5000-0218   3\n",
+       "3        0000-0001-5000-0226   1\n",
+       "4        0000-0001-5000-0306   0\n",
+       "...                      ...  ..\n",
+       "2441640  0000-0003-4999-9719   1\n",
+       "2441641  0000-0003-4999-9735   1\n",
+       "2441642  0000-0003-4999-992X   2\n",
+       "2441643  0000-0003-4999-9938   2\n",
+       "2441644  0000-0003-4999-9954   1\n",
+       "\n",
+       "[2441645 rows x 2 columns]"
+      ]
+     },
+     "execution_count": 132,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "exploded_education.groupby('orcid').id.count().reset_index()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 133,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "df = df.merge(exploded_education.groupby('orcid').id.count().reset_index(), on='orcid')\n",
+    "df.rename(columns={'id': 'n_valid_education'}, inplace=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 134,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
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+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>verified_email</th>\n",
+       "      <th>verified_primary_email</th>\n",
+       "      <th>given_names</th>\n",
+       "      <th>family_name</th>\n",
+       "      <th>biography</th>\n",
+       "      <th>other_names</th>\n",
+       "      <th>primary_email</th>\n",
+       "      <th>keywords</th>\n",
+       "      <th>external_ids</th>\n",
+       "      <th>education</th>\n",
+       "      <th>employment</th>\n",
+       "      <th>n_works</th>\n",
+       "      <th>works_source</th>\n",
+       "      <th>activation_date</th>\n",
+       "      <th>last_update_date</th>\n",
+       "      <th>n_doi</th>\n",
+       "      <th>n_arxiv</th>\n",
+       "      <th>n_pmc</th>\n",
+       "      <th>n_other_pids</th>\n",
+       "      <th>label</th>\n",
+       "      <th>primary_email_domain</th>\n",
+       "      <th>other_email_domains</th>\n",
+       "      <th>url_domains</th>\n",
+       "      <th>n_emails</th>\n",
+       "      <th>n_urls</th>\n",
+       "      <th>n_ids</th>\n",
+       "      <th>n_keywords</th>\n",
+       "      <th>n_education</th>\n",
+       "      <th>n_employment</th>\n",
+       "      <th>ext_works_source</th>\n",
+       "      <th>n_ext_work_source</th>\n",
+       "      <th>authoritative</th>\n",
+       "      <th>spam_score</th>\n",
+       "      <th>n_valid_employment</th>\n",
+       "      <th>n_valid_education</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>0000-0003-1435-6545</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[prostate cancer, migration, culture cell]</td>\n",
+       "      <td>[[researcherid, p-2223-2018]]</td>\n",
+       "      <td>[[morfologia, , universidade estadual paulista...</td>\n",
+       "      <td>[[, universidade estadual paulista (unesp), in...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2018-08-09t12:12:24.405z</td>\n",
+       "      <td>2020-04-22t01:38:03.184z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[cnpq.br, linkedin.com]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>1</td>\n",
+       "      <td>3</td>\n",
+       "      <td>1</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>0000-0002-0427-9745</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>a. can</td>\n",
+       "      <td>inci</td>\n",
+       "      <td>i am a professor of finance at bryant universi...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[researcherid, b-5471-2018], [scopus author i...</td>\n",
+       "      <td>[[finance, ph.d., university of michigan - ros...</td>\n",
+       "      <td>[[professor of finance, bryant university, smi...</td>\n",
+       "      <td>34</td>\n",
+       "      <td>[a. can inci]</td>\n",
+       "      <td>2018-01-20t02:58:05.199z</td>\n",
+       "      <td>2020-06-16t12:35:09.403z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5</td>\n",
+       "      <td>[]</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>4.341588e-10</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>0000-0002-3380-6671</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>abdul</td>\n",
+       "      <td>asis pata</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[agribisnis, m.si, universitas hasanuddin, ma...</td>\n",
+       "      <td>[[s.p, universitas muslim maros, maros, , id, ...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
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+       "      <td>0</td>\n",
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+       "      <td>NaN</td>\n",
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+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
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+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>0000-0001-6902-6549</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>abubakar</td>\n",
+       "      <td>muhammad</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[school of electrical and information enginee...</td>\n",
+       "      <td>[[lecturer, university of faisalabad, faisalab...</td>\n",
+       "      <td>1</td>\n",
+       "      <td>[multidisciplinary digital publishing institute]</td>\n",
+       "      <td>2017-07-06t10:29:17.738z</td>\n",
+       "      <td>2020-08-01t05:18:53.393z</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>True</td>\n",
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+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>1</td>\n",
+       "      <td>[multidisciplinary digital publishing institute]</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
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+       "      <th>12</th>\n",
+       "      <td>0000-0002-6142-6406</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>adam</td>\n",
+       "      <td>mamadou</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[département deconomie sociologie rurale et t...</td>\n",
+       "      <td>[[, institut national de la recherche agronomi...</td>\n",
+       "      <td>0</td>\n",
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+       "      <td>2018-02-15t09:54:59.943z</td>\n",
+       "      <td>2018-02-15t10:19:27.869z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
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+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
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+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1753316</th>\n",
+       "      <td>0000-0002-1842-4130</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>josé de jesús</td>\n",
+       "      <td>cázares-marinero</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[josé cázares]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[chemical biology, industrial chemistry, biote...</td>\n",
+       "      <td>[[researcherid, h-2597-2013], [scopus author i...</td>\n",
+       "      <td>[[charles friedel, postdoc, école nationale su...</td>\n",
+       "      <td>[[mtc, polioles, mexico, , mx, , ], [head of r...</td>\n",
+       "      <td>17</td>\n",
+       "      <td>[crossref metadata search, scopus - elsevier, ...</td>\n",
+       "      <td>2013-07-09t14:39:30.950z</td>\n",
+       "      <td>2020-12-10t17:42:20.176z</td>\n",
+       "      <td>17</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>29</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[linkedin.com, google.com, researchgate.net]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>3</td>\n",
+       "      <td>2</td>\n",
+       "      <td>5</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3</td>\n",
+       "      <td>[crossref metadata search, scopus - elsevier]</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1753319</th>\n",
+       "      <td>0000-0003-0459-4822</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>luana</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>mestranda em tecnologia na saúde e foi aluna o...</td>\n",
+       "      <td>[luana bastos morey]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[tradução; língua espanhol; língua portuguesa;...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[pós-graduação em tecnologia em saúde stricto...</td>\n",
+       "      <td>[[professora de espanhol e português para estr...</td>\n",
+       "      <td>7</td>\n",
+       "      <td>[luana arrial bastos]</td>\n",
+       "      <td>2017-05-11t13:14:59.372z</td>\n",
+       "      <td>2020-12-08t20:18:24.163z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[unidospelasaude.com.br, facebook.com, faceboo...</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>4</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>4</td>\n",
+       "      <td>3</td>\n",
+       "      <td>[]</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>1.000000e+00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>3</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1753320</th>\n",
+       "      <td>0000-0003-0057-1551</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>lyudmyla</td>\n",
+       "      <td>antypenko</td>\n",
+       "      <td>the phd degree of pharmacy was received under ...</td>\n",
+       "      <td>[lyudmila nikolaevna antipenko (russian transl...</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[pharmaceutical chemistry, organic synthesis, ...</td>\n",
+       "      <td>[[scopus author id, 55070809900], [researcheri...</td>\n",
+       "      <td>[[centre for nanomaterials, advanced technolog...</td>\n",
+       "      <td>[[visiting scientist, north dakota state unive...</td>\n",
+       "      <td>35</td>\n",
+       "      <td>[crossref metadata search, scopus - elsevier, ...</td>\n",
+       "      <td>2014-02-19t08:15:15.698z</td>\n",
+       "      <td>2020-12-09t18:14:17.963z</td>\n",
+       "      <td>28</td>\n",
+       "      <td>0</td>\n",
+       "      <td>11</td>\n",
+       "      <td>17</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>5</td>\n",
+       "      <td>7</td>\n",
+       "      <td>8</td>\n",
+       "      <td>[crossref metadata search, scopus - elsevier, ...</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>1.000000e+00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>4</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1753325</th>\n",
+       "      <td>0000-0003-4653-4705</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>patricia</td>\n",
+       "      <td>teixeira</td>\n",
+       "      <td>2005 - phd, university of coimbrajuly 2009-jun...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[ecotoxicology, heavy metals, steroid hormones...</td>\n",
+       "      <td>[[researcherid, i-6863-2013], [scopus author i...</td>\n",
+       "      <td>[[, phd, university of coimbra, coimbra, , pt,...</td>\n",
+       "      <td>[[senior researcher, university of coimbra, co...</td>\n",
+       "      <td>95</td>\n",
+       "      <td>[ciênciavitae, scopus - elsevier, pg cardoso, ...</td>\n",
+       "      <td>2013-11-26t10:59:34.331z</td>\n",
+       "      <td>2020-12-02t15:28:26.221z</td>\n",
+       "      <td>90</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>42</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>3</td>\n",
+       "      <td>7</td>\n",
+       "      <td>1</td>\n",
+       "      <td>3</td>\n",
+       "      <td>[ciênciavitae, scopus - elsevier, pg cardoso, ...</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>7.147059e-10</td>\n",
+       "      <td>3</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1753337</th>\n",
+       "      <td>0000-0002-1686-1935</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>youxia</td>\n",
+       "      <td>wang</td>\n",
+       "      <td>youxia wang (1995-), native of zunyi, guizhou ...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[institute of animal nutrition, master degree...</td>\n",
+       "      <td>[[master, sichuan agricultural university , ch...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2020-12-11t02:11:51.808z</td>\n",
+       "      <td>2020-12-11t03:25:28.263z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>4.475163e-02</td>\n",
+       "      <td>1</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>473043 rows × 36 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  verified_email  verified_primary_email  \\\n",
+       "2        0000-0003-1435-6545            True                    True   \n",
+       "6        0000-0002-0427-9745            True                    True   \n",
+       "9        0000-0002-3380-6671            True                    True   \n",
+       "11       0000-0001-6902-6549            True                    True   \n",
+       "12       0000-0002-6142-6406            True                    True   \n",
+       "...                      ...             ...                     ...   \n",
+       "1753316  0000-0002-1842-4130            True                    True   \n",
+       "1753319  0000-0003-0459-4822            True                    True   \n",
+       "1753320  0000-0003-0057-1551            True                    True   \n",
+       "1753325  0000-0003-4653-4705            True                    True   \n",
+       "1753337  0000-0002-1686-1935            True                    True   \n",
+       "\n",
+       "           given_names       family_name  \\\n",
+       "2                 <NA>              <NA>   \n",
+       "6               a. can              inci   \n",
+       "9                abdul         asis pata   \n",
+       "11            abubakar          muhammad   \n",
+       "12                adam           mamadou   \n",
+       "...                ...               ...   \n",
+       "1753316  josé de jesús  cázares-marinero   \n",
+       "1753319          luana              <NA>   \n",
+       "1753320       lyudmyla         antypenko   \n",
+       "1753325       patricia          teixeira   \n",
+       "1753337         youxia              wang   \n",
+       "\n",
+       "                                                 biography  \\\n",
+       "2                                                     <NA>   \n",
+       "6        i am a professor of finance at bryant universi...   \n",
+       "9                                                     <NA>   \n",
+       "11                                                    <NA>   \n",
+       "12                                                    <NA>   \n",
+       "...                                                    ...   \n",
+       "1753316                                               <NA>   \n",
+       "1753319  mestranda em tecnologia na saúde e foi aluna o...   \n",
+       "1753320  the phd degree of pharmacy was received under ...   \n",
+       "1753325  2005 - phd, university of coimbrajuly 2009-jun...   \n",
+       "1753337  youxia wang (1995-), native of zunyi, guizhou ...   \n",
+       "\n",
+       "                                               other_names primary_email  \\\n",
+       "2                                                      NaN          <NA>   \n",
+       "6                                                      NaN          <NA>   \n",
+       "9                                                      NaN          <NA>   \n",
+       "11                                                     NaN          <NA>   \n",
+       "12                                                     NaN          <NA>   \n",
+       "...                                                    ...           ...   \n",
+       "1753316                                     [josé cázares]          <NA>   \n",
+       "1753319                               [luana bastos morey]          <NA>   \n",
+       "1753320  [lyudmila nikolaevna antipenko (russian transl...          <NA>   \n",
+       "1753325                                                NaN          <NA>   \n",
+       "1753337                                                NaN          <NA>   \n",
+       "\n",
+       "                                                  keywords  \\\n",
+       "2               [prostate cancer, migration, culture cell]   \n",
+       "6                                                      NaN   \n",
+       "9                                                      NaN   \n",
+       "11                                                     NaN   \n",
+       "12                                                     NaN   \n",
+       "...                                                    ...   \n",
+       "1753316  [chemical biology, industrial chemistry, biote...   \n",
+       "1753319  [tradução; língua espanhol; língua portuguesa;...   \n",
+       "1753320  [pharmaceutical chemistry, organic synthesis, ...   \n",
+       "1753325  [ecotoxicology, heavy metals, steroid hormones...   \n",
+       "1753337                                                NaN   \n",
+       "\n",
+       "                                              external_ids  \\\n",
+       "2                            [[researcherid, p-2223-2018]]   \n",
+       "6        [[researcherid, b-5471-2018], [scopus author i...   \n",
+       "9                                                      NaN   \n",
+       "11                                                     NaN   \n",
+       "12                                                     NaN   \n",
+       "...                                                    ...   \n",
+       "1753316  [[researcherid, h-2597-2013], [scopus author i...   \n",
+       "1753319                                                NaN   \n",
+       "1753320  [[scopus author id, 55070809900], [researcheri...   \n",
+       "1753325  [[researcherid, i-6863-2013], [scopus author i...   \n",
+       "1753337                                                NaN   \n",
+       "\n",
+       "                                                 education  \\\n",
+       "2        [[morfologia, , universidade estadual paulista...   \n",
+       "6        [[finance, ph.d., university of michigan - ros...   \n",
+       "9        [[agribisnis, m.si, universitas hasanuddin, ma...   \n",
+       "11       [[school of electrical and information enginee...   \n",
+       "12       [[département deconomie sociologie rurale et t...   \n",
+       "...                                                    ...   \n",
+       "1753316  [[charles friedel, postdoc, école nationale su...   \n",
+       "1753319  [[pós-graduação em tecnologia em saúde stricto...   \n",
+       "1753320  [[centre for nanomaterials, advanced technolog...   \n",
+       "1753325  [[, phd, university of coimbra, coimbra, , pt,...   \n",
+       "1753337  [[institute of animal nutrition, master degree...   \n",
+       "\n",
+       "                                                employment  n_works  \\\n",
+       "2        [[, universidade estadual paulista (unesp), in...        0   \n",
+       "6        [[professor of finance, bryant university, smi...       34   \n",
+       "9        [[s.p, universitas muslim maros, maros, , id, ...        0   \n",
+       "11       [[lecturer, university of faisalabad, faisalab...        1   \n",
+       "12       [[, institut national de la recherche agronomi...        0   \n",
+       "...                                                    ...      ...   \n",
+       "1753316  [[mtc, polioles, mexico, , mx, , ], [head of r...       17   \n",
+       "1753319  [[professora de espanhol e português para estr...        7   \n",
+       "1753320  [[visiting scientist, north dakota state unive...       35   \n",
+       "1753325  [[senior researcher, university of coimbra, co...       95   \n",
+       "1753337  [[master, sichuan agricultural university , ch...        0   \n",
+       "\n",
+       "                                              works_source  \\\n",
+       "2                                                      NaN   \n",
+       "6                                            [a. can inci]   \n",
+       "9                                                      NaN   \n",
+       "11        [multidisciplinary digital publishing institute]   \n",
+       "12                                                     NaN   \n",
+       "...                                                    ...   \n",
+       "1753316  [crossref metadata search, scopus - elsevier, ...   \n",
+       "1753319                              [luana arrial bastos]   \n",
+       "1753320  [crossref metadata search, scopus - elsevier, ...   \n",
+       "1753325  [ciênciavitae, scopus - elsevier, pg cardoso, ...   \n",
+       "1753337                                                NaN   \n",
+       "\n",
+       "                  activation_date          last_update_date  n_doi  n_arxiv  \\\n",
+       "2        2018-08-09t12:12:24.405z  2020-04-22t01:38:03.184z      0        0   \n",
+       "6        2018-01-20t02:58:05.199z  2020-06-16t12:35:09.403z      0        0   \n",
+       "9        2018-02-12t02:08:37.018z  2018-02-12t02:22:33.378z      0        0   \n",
+       "11       2017-07-06t10:29:17.738z  2020-08-01t05:18:53.393z      1        0   \n",
+       "12       2018-02-15t09:54:59.943z  2018-02-15t10:19:27.869z      0        0   \n",
+       "...                           ...                       ...    ...      ...   \n",
+       "1753316  2013-07-09t14:39:30.950z  2020-12-10t17:42:20.176z     17        0   \n",
+       "1753319  2017-05-11t13:14:59.372z  2020-12-08t20:18:24.163z      0        0   \n",
+       "1753320  2014-02-19t08:15:15.698z  2020-12-09t18:14:17.963z     28        0   \n",
+       "1753325  2013-11-26t10:59:34.331z  2020-12-02t15:28:26.221z     90        0   \n",
+       "1753337  2020-12-11t02:11:51.808z  2020-12-11t03:25:28.263z      0        0   \n",
+       "\n",
+       "         n_pmc  n_other_pids  label primary_email_domain other_email_domains  \\\n",
+       "2            0             0  False                  NaN                 NaN   \n",
+       "6            0             0  False                  NaN                 NaN   \n",
+       "9            0             0  False                  NaN                 NaN   \n",
+       "11           0             0   True                  NaN                 NaN   \n",
+       "12           0             0  False                  NaN                 NaN   \n",
+       "...        ...           ...    ...                  ...                 ...   \n",
+       "1753316      0            29  False                  NaN                 NaN   \n",
+       "1753319      0             0  False                  NaN                 NaN   \n",
+       "1753320     11            17   True                  NaN                 NaN   \n",
+       "1753325      0            42  False                  NaN                 NaN   \n",
+       "1753337      0             0  False                  NaN                 NaN   \n",
+       "\n",
+       "                                               url_domains  n_emails  n_urls  \\\n",
+       "2                                  [cnpq.br, linkedin.com]      <NA>       2   \n",
+       "6                                                      NaN      <NA>    <NA>   \n",
+       "9                                                      NaN      <NA>    <NA>   \n",
+       "11                                                     NaN      <NA>    <NA>   \n",
+       "12                                                     NaN      <NA>    <NA>   \n",
+       "...                                                    ...       ...     ...   \n",
+       "1753316       [linkedin.com, google.com, researchgate.net]      <NA>       3   \n",
+       "1753319  [unidospelasaude.com.br, facebook.com, faceboo...      <NA>       4   \n",
+       "1753320                                                NaN      <NA>    <NA>   \n",
+       "1753325                                                NaN      <NA>    <NA>   \n",
+       "1753337                                                NaN      <NA>    <NA>   \n",
+       "\n",
+       "         n_ids  n_keywords  n_education  n_employment  \\\n",
+       "2            1           3            1             1   \n",
+       "6            2        <NA>            4             5   \n",
+       "9         <NA>        <NA>            1             1   \n",
+       "11        <NA>        <NA>            1             1   \n",
+       "12        <NA>        <NA>            1             1   \n",
+       "...        ...         ...          ...           ...   \n",
+       "1753316      2           5            3             3   \n",
+       "1753319   <NA>           2            4             3   \n",
+       "1753320      2           5            7             8   \n",
+       "1753325      3           7            1             3   \n",
+       "1753337   <NA>        <NA>            2             1   \n",
+       "\n",
+       "                                          ext_works_source  n_ext_work_source  \\\n",
+       "2                                                      NaN                NaN   \n",
+       "6                                                       []                0.0   \n",
+       "9                                                      NaN                NaN   \n",
+       "11        [multidisciplinary digital publishing institute]                1.0   \n",
+       "12                                                     NaN                NaN   \n",
+       "...                                                    ...                ...   \n",
+       "1753316      [crossref metadata search, scopus - elsevier]                2.0   \n",
+       "1753319                                                 []                0.0   \n",
+       "1753320  [crossref metadata search, scopus - elsevier, ...                4.0   \n",
+       "1753325  [ciênciavitae, scopus - elsevier, pg cardoso, ...                4.0   \n",
+       "1753337                                                NaN                NaN   \n",
+       "\n",
+       "        authoritative    spam_score  n_valid_employment  n_valid_education  \n",
+       "2               False           NaN                   0                  0  \n",
+       "6               False  4.341588e-10                   0                  0  \n",
+       "9               False           NaN                   0                  0  \n",
+       "11               True           NaN                   0                  0  \n",
+       "12              False           NaN                   0                  0  \n",
+       "...               ...           ...                 ...                ...  \n",
+       "1753316          True           NaN                   0                  0  \n",
+       "1753319         False  1.000000e+00                   2                  3  \n",
+       "1753320          True  1.000000e+00                   2                  4  \n",
+       "1753325          True  7.147059e-10                   3                  0  \n",
+       "1753337         False  4.475163e-02                   1                  1  \n",
+       "\n",
+       "[473043 rows x 36 columns]"
+      ]
+     },
+     "execution_count": 134,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "df[df.n_education != df.n_valid_education]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -15573,33 +16709,1796 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 58,
+   "execution_count": 116,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "count    2.680488e+06\n",
+       "mean     1.664713e+00\n",
+       "std      1.530077e+00\n",
+       "min      1.000000e+00\n",
+       "25%      1.000000e+00\n",
+       "50%      1.000000e+00\n",
+       "75%      2.000000e+00\n",
+       "max      1.980000e+02\n",
+       "Name: n_employment, dtype: float64"
+      ]
+     },
+     "execution_count": 116,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "def extract_employment(lst):\n",
-    "    res = []\n",
-    "    for e in lst:\n",
-    "        # e[0] role\n",
-    "        # e[1] institute\n",
-    "        # e[..] city, region, country, id, id_scheme\n",
-    "        res.append(' '.join([e[0], e[1]]))\n",
-    "    return res"
+    "df.n_employment.describe()"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 119,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>verified_email</th>\n",
+       "      <th>verified_primary_email</th>\n",
+       "      <th>given_names</th>\n",
+       "      <th>family_name</th>\n",
+       "      <th>biography</th>\n",
+       "      <th>other_names</th>\n",
+       "      <th>primary_email</th>\n",
+       "      <th>keywords</th>\n",
+       "      <th>external_ids</th>\n",
+       "      <th>education</th>\n",
+       "      <th>employment</th>\n",
+       "      <th>n_works</th>\n",
+       "      <th>works_source</th>\n",
+       "      <th>activation_date</th>\n",
+       "      <th>last_update_date</th>\n",
+       "      <th>n_doi</th>\n",
+       "      <th>n_arxiv</th>\n",
+       "      <th>n_pmc</th>\n",
+       "      <th>n_other_pids</th>\n",
+       "      <th>label</th>\n",
+       "      <th>primary_email_domain</th>\n",
+       "      <th>other_email_domains</th>\n",
+       "      <th>url_domains</th>\n",
+       "      <th>n_emails</th>\n",
+       "      <th>n_urls</th>\n",
+       "      <th>n_ids</th>\n",
+       "      <th>n_keywords</th>\n",
+       "      <th>n_education</th>\n",
+       "      <th>n_employment</th>\n",
+       "      <th>ext_works_source</th>\n",
+       "      <th>n_ext_work_source</th>\n",
+       "      <th>authoritative</th>\n",
+       "      <th>spam_score</th>\n",
+       "      <th>n_valid_employment</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>2020738</th>\n",
+       "      <td>0000-0002-0293-964X</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>ben zhong</td>\n",
+       "      <td>tang</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[唐本忠]</td>\n",
+       "      <td>tangbenz@ust.hk</td>\n",
+       "      <td>[fluorescent biosensors, light-emitting molecu...</td>\n",
+       "      <td>[[hkust profile, tang-benzhong], [researcherid...</td>\n",
+       "      <td>[[department of chemistry and faculty of pharm...</td>\n",
+       "      <td>[[chair professor, division of biomedical engi...</td>\n",
+       "      <td>422</td>\n",
+       "      <td>[tang, benzhong, crossref]</td>\n",
+       "      <td>2015-03-13t00:28:33.270z</td>\n",
+       "      <td>2021-03-23t07:56:34.824z</td>\n",
+       "      <td>359</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>ust.hk</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[ust.hk]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>3</td>\n",
+       "      <td>7</td>\n",
+       "      <td>7</td>\n",
+       "      <td>198</td>\n",
+       "      <td>[crossref]</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>32</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  verified_email  verified_primary_email  \\\n",
+       "2020738  0000-0002-0293-964X            True                    True   \n",
+       "\n",
+       "        given_names family_name biography other_names    primary_email  \\\n",
+       "2020738   ben zhong        tang      <NA>       [唐本忠]  tangbenz@ust.hk   \n",
+       "\n",
+       "                                                  keywords  \\\n",
+       "2020738  [fluorescent biosensors, light-emitting molecu...   \n",
+       "\n",
+       "                                              external_ids  \\\n",
+       "2020738  [[hkust profile, tang-benzhong], [researcherid...   \n",
+       "\n",
+       "                                                 education  \\\n",
+       "2020738  [[department of chemistry and faculty of pharm...   \n",
+       "\n",
+       "                                                employment  n_works  \\\n",
+       "2020738  [[chair professor, division of biomedical engi...      422   \n",
+       "\n",
+       "                       works_source           activation_date  \\\n",
+       "2020738  [tang, benzhong, crossref]  2015-03-13t00:28:33.270z   \n",
+       "\n",
+       "                 last_update_date  n_doi  n_arxiv  n_pmc  n_other_pids  label  \\\n",
+       "2020738  2021-03-23t07:56:34.824z    359        0      0             0  False   \n",
+       "\n",
+       "        primary_email_domain other_email_domains url_domains  n_emails  \\\n",
+       "2020738               ust.hk                 NaN    [ust.hk]      <NA>   \n",
+       "\n",
+       "         n_urls  n_ids  n_keywords  n_education  n_employment  \\\n",
+       "2020738       1      3           7            7           198   \n",
+       "\n",
+       "        ext_works_source  n_ext_work_source authoritative  spam_score  \\\n",
+       "2020738       [crossref]                1.0          True         NaN   \n",
+       "\n",
+       "         n_valid_employment  \n",
+       "2020738                  32  "
+      ]
+     },
+     "execution_count": 119,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "df[df.n_employment == df.n_employment.max()]"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Let's count how many employments have a valid assigned id by orcid (ringols, isni, grid, etc.)"
+   ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 60,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>employment</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>0000-0001-6112-5550</td>\n",
+       "      <td>[professor, peoples friendship university of r...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>0000-0001-6220-5683</td>\n",
+       "      <td>[research scientist, new york university abu d...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>0000-0001-7071-8294</td>\n",
+       "      <td>[researcher (academic), universidad de zaragoz...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>0000-0001-7071-8294</td>\n",
+       "      <td>[researcher (academic), instituto de síntesis ...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>0000-0001-7402-0096</td>\n",
+       "      <td>[, kth royal institute of technology, stockhol...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10989643</th>\n",
+       "      <td>0000-0003-2606-0936</td>\n",
+       "      <td>[post-doc, institute of biochemistry and cell ...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10989644</th>\n",
+       "      <td>0000-0002-1686-1935</td>\n",
+       "      <td>[master, sichuan agricultural university , che...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10989645</th>\n",
+       "      <td>0000-0002-3800-6331</td>\n",
+       "      <td>[assistant professor, baruch college, city uni...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10989645</th>\n",
+       "      <td>0000-0002-3800-6331</td>\n",
+       "      <td>[postdoctoral scholar, university of californi...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10989647</th>\n",
+       "      <td>0000-0002-7584-2283</td>\n",
+       "      <td>[lecturer, henan institute of science and tech...</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>4462243 rows × 2 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                        orcid  \\\n",
+       "1         0000-0001-6112-5550   \n",
+       "3         0000-0001-6220-5683   \n",
+       "4         0000-0001-7071-8294   \n",
+       "4         0000-0001-7071-8294   \n",
+       "6         0000-0001-7402-0096   \n",
+       "...                       ...   \n",
+       "10989643  0000-0003-2606-0936   \n",
+       "10989644  0000-0002-1686-1935   \n",
+       "10989645  0000-0002-3800-6331   \n",
+       "10989645  0000-0002-3800-6331   \n",
+       "10989647  0000-0002-7584-2283   \n",
+       "\n",
+       "                                                 employment  \n",
+       "1         [professor, peoples friendship university of r...  \n",
+       "3         [research scientist, new york university abu d...  \n",
+       "4         [researcher (academic), universidad de zaragoz...  \n",
+       "4         [researcher (academic), instituto de síntesis ...  \n",
+       "6         [, kth royal institute of technology, stockhol...  \n",
+       "...                                                     ...  \n",
+       "10989643  [post-doc, institute of biochemistry and cell ...  \n",
+       "10989644  [master, sichuan agricultural university , che...  \n",
+       "10989645  [assistant professor, baruch college, city uni...  \n",
+       "10989645  [postdoctoral scholar, university of californi...  \n",
+       "10989647  [lecturer, henan institute of science and tech...  \n",
+       "\n",
+       "[4462243 rows x 2 columns]"
+      ]
+     },
+     "execution_count": 60,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "exploded_employment = df[['orcid', 'employment']].explode('employment').dropna()\n",
+    "exploded_employment"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 61,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "exploded_employment[['role', 'institution', 'city', 'region', 'country', 'id', 'id_scheme']] = pd.DataFrame(exploded_employment.employment.tolist(), index=exploded_employment.index)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 83,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "exploded_employment.id.replace('', pd.NA, inplace=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 105,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
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+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>id</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>0000-0001-5000-0031</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>0000-0001-5000-0138</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>0000-0001-5000-0170</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>0000-0001-5000-0218</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>0000-0001-5000-0226</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680483</th>\n",
+       "      <td>0000-0003-4999-9831</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680484</th>\n",
+       "      <td>0000-0003-4999-9890</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680485</th>\n",
+       "      <td>0000-0003-4999-992X</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680486</th>\n",
+       "      <td>0000-0003-4999-9938</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680487</th>\n",
+       "      <td>0000-0003-4999-9954</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>2680488 rows × 2 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  id\n",
+       "0        0000-0001-5000-0031   1\n",
+       "1        0000-0001-5000-0138   1\n",
+       "2        0000-0001-5000-0170   2\n",
+       "3        0000-0001-5000-0218   1\n",
+       "4        0000-0001-5000-0226   1\n",
+       "...                      ...  ..\n",
+       "2680483  0000-0003-4999-9831   1\n",
+       "2680484  0000-0003-4999-9890   1\n",
+       "2680485  0000-0003-4999-992X   0\n",
+       "2680486  0000-0003-4999-9938   1\n",
+       "2680487  0000-0003-4999-9954   2\n",
+       "\n",
+       "[2680488 rows x 2 columns]"
+      ]
+     },
+     "execution_count": 105,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "exploded_employment.groupby('orcid').id.count().reset_index()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 106,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
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+       "\n",
+       "    .dataframe tbody tr th {\n",
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+       "\n",
+       "    .dataframe thead th {\n",
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+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>verified_email</th>\n",
+       "      <th>verified_primary_email</th>\n",
+       "      <th>given_names</th>\n",
+       "      <th>family_name</th>\n",
+       "      <th>biography</th>\n",
+       "      <th>other_names</th>\n",
+       "      <th>primary_email</th>\n",
+       "      <th>keywords</th>\n",
+       "      <th>external_ids</th>\n",
+       "      <th>education</th>\n",
+       "      <th>employment</th>\n",
+       "      <th>n_works</th>\n",
+       "      <th>works_source</th>\n",
+       "      <th>activation_date</th>\n",
+       "      <th>last_update_date</th>\n",
+       "      <th>n_doi</th>\n",
+       "      <th>n_arxiv</th>\n",
+       "      <th>n_pmc</th>\n",
+       "      <th>n_other_pids</th>\n",
+       "      <th>label</th>\n",
+       "      <th>primary_email_domain</th>\n",
+       "      <th>other_email_domains</th>\n",
+       "      <th>url_domains</th>\n",
+       "      <th>n_emails</th>\n",
+       "      <th>n_urls</th>\n",
+       "      <th>n_ids</th>\n",
+       "      <th>n_keywords</th>\n",
+       "      <th>n_education</th>\n",
+       "      <th>n_employment</th>\n",
+       "      <th>ext_works_source</th>\n",
+       "      <th>n_ext_work_source</th>\n",
+       "      <th>authoritative</th>\n",
+       "      <th>spam_score</th>\n",
+       "      <th>n_valid_employment</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>0000-0001-6112-5550</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[v.i. yurtaev; v. yurtaev]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[professor, peoples friendship university of ...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2018-04-03t07:50:23.358z</td>\n",
+       "      <td>2020-03-18t09:42:44.753z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>0000-0001-6220-5683</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[research scientist, new york university abu ...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2015-08-18t12:36:45.307z</td>\n",
+       "      <td>2020-09-23t13:37:54.180z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>0000-0001-7071-8294</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[researcher (academic), universidad de zarago...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2014-03-10t13:22:01.966z</td>\n",
+       "      <td>2016-06-14t22:17:54.470z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>0000-0001-7402-0096</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[, kth royal institute of technology, stockho...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2015-01-11t15:13:06.467z</td>\n",
+       "      <td>2016-06-14t23:55:59.896z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[kth.se]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>0000-0001-8315-2066</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[iron chlorosis, fertilizers, calcareous soil,...</td>\n",
+       "      <td>[[researcherid, k-4630-2014]]</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[, universidad de córdoba, córdoba, andalucía...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2014-05-26t08:57:12.661z</td>\n",
+       "      <td>2019-03-27t07:53:48.987z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>4</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680483</th>\n",
+       "      <td>0000-0002-8004-688X</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>paul</td>\n",
+       "      <td>wanjala muyoma</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[wanjala]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[environment and sustainability]</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[graduate teaching assistant, university of p...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2016-03-07t08:53:06.561z</td>\n",
+       "      <td>2020-12-02t02:14:50.213z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680484</th>\n",
+       "      <td>0000-0003-2606-0936</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>luang</td>\n",
+       "      <td>xu</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[xu lu-ang, lu lu]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[post-doc, institute of biochemistry and cell...</td>\n",
+       "      <td>2</td>\n",
+       "      <td>[scopus - elsevier, crossref]</td>\n",
+       "      <td>2015-10-24t03:53:23.544z</td>\n",
+       "      <td>2020-11-19t09:23:48.896z</td>\n",
+       "      <td>2</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>[scopus - elsevier, crossref]</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680485</th>\n",
+       "      <td>0000-0002-1686-1935</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>youxia</td>\n",
+       "      <td>wang</td>\n",
+       "      <td>youxia wang (1995-), native of zunyi, guizhou ...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[institute of animal nutrition, master degree...</td>\n",
+       "      <td>[[master, sichuan agricultural university , ch...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2020-12-11t02:11:51.808z</td>\n",
+       "      <td>2020-12-11t03:25:28.263z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>0.044752</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680486</th>\n",
+       "      <td>0000-0002-3800-6331</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>zachary</td>\n",
+       "      <td>calamari</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[richard gilder graduate school, phd in compa...</td>\n",
+       "      <td>[[assistant professor, baruch college, city un...</td>\n",
+       "      <td>7</td>\n",
+       "      <td>[crossref metadata search, zachary t. calamari...</td>\n",
+       "      <td>2015-01-20t20:20:17.042z</td>\n",
+       "      <td>2020-11-21t19:48:36.221z</td>\n",
+       "      <td>7</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2</td>\n",
+       "      <td>[crossref metadata search, crossref]</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680487</th>\n",
+       "      <td>0000-0002-7584-2283</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>现刚</td>\n",
+       "      <td>左</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[zuo xiangang, xiangang zuo, zuo x g, x g zuo]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[school of electronics and information, maste...</td>\n",
+       "      <td>[[lecturer, henan institute of science and tec...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2016-12-27t07:45:25.073z</td>\n",
+       "      <td>2020-11-29t13:06:17.582z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>2680488 rows × 35 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  verified_email  verified_primary_email  \\\n",
+       "0        0000-0001-6112-5550            True                    True   \n",
+       "1        0000-0001-6220-5683            True                    True   \n",
+       "2        0000-0001-7071-8294            True                    True   \n",
+       "3        0000-0001-7402-0096            True                    True   \n",
+       "4        0000-0001-8315-2066            True                    True   \n",
+       "...                      ...             ...                     ...   \n",
+       "2680483  0000-0002-8004-688X            True                    True   \n",
+       "2680484  0000-0003-2606-0936            True                    True   \n",
+       "2680485  0000-0002-1686-1935            True                    True   \n",
+       "2680486  0000-0002-3800-6331            True                    True   \n",
+       "2680487  0000-0002-7584-2283            True                    True   \n",
+       "\n",
+       "        given_names     family_name  \\\n",
+       "0              <NA>            <NA>   \n",
+       "1              <NA>            <NA>   \n",
+       "2              <NA>            <NA>   \n",
+       "3              <NA>            <NA>   \n",
+       "4              <NA>            <NA>   \n",
+       "...             ...             ...   \n",
+       "2680483        paul  wanjala muyoma   \n",
+       "2680484       luang              xu   \n",
+       "2680485      youxia            wang   \n",
+       "2680486     zachary        calamari   \n",
+       "2680487          现刚               左   \n",
+       "\n",
+       "                                                 biography  \\\n",
+       "0                                                     <NA>   \n",
+       "1                                                     <NA>   \n",
+       "2                                                     <NA>   \n",
+       "3                                                     <NA>   \n",
+       "4                                                     <NA>   \n",
+       "...                                                    ...   \n",
+       "2680483                                               <NA>   \n",
+       "2680484                                               <NA>   \n",
+       "2680485  youxia wang (1995-), native of zunyi, guizhou ...   \n",
+       "2680486                                               <NA>   \n",
+       "2680487                                               <NA>   \n",
+       "\n",
+       "                                            other_names primary_email  \\\n",
+       "0                            [v.i. yurtaev; v. yurtaev]          <NA>   \n",
+       "1                                                   NaN          <NA>   \n",
+       "2                                                   NaN          <NA>   \n",
+       "3                                                   NaN          <NA>   \n",
+       "4                                                   NaN          <NA>   \n",
+       "...                                                 ...           ...   \n",
+       "2680483                                       [wanjala]          <NA>   \n",
+       "2680484                              [xu lu-ang, lu lu]          <NA>   \n",
+       "2680485                                             NaN          <NA>   \n",
+       "2680486                                             NaN          <NA>   \n",
+       "2680487  [zuo xiangang, xiangang zuo, zuo x g, x g zuo]          <NA>   \n",
+       "\n",
+       "                                                  keywords  \\\n",
+       "0                                                      NaN   \n",
+       "1                                                      NaN   \n",
+       "2                                                      NaN   \n",
+       "3                                                      NaN   \n",
+       "4        [iron chlorosis, fertilizers, calcareous soil,...   \n",
+       "...                                                    ...   \n",
+       "2680483                   [environment and sustainability]   \n",
+       "2680484                                                NaN   \n",
+       "2680485                                                NaN   \n",
+       "2680486                                                NaN   \n",
+       "2680487                                                NaN   \n",
+       "\n",
+       "                          external_ids  \\\n",
+       "0                                  NaN   \n",
+       "1                                  NaN   \n",
+       "2                                  NaN   \n",
+       "3                                  NaN   \n",
+       "4        [[researcherid, k-4630-2014]]   \n",
+       "...                                ...   \n",
+       "2680483                            NaN   \n",
+       "2680484                            NaN   \n",
+       "2680485                            NaN   \n",
+       "2680486                            NaN   \n",
+       "2680487                            NaN   \n",
+       "\n",
+       "                                                 education  \\\n",
+       "0                                                      NaN   \n",
+       "1                                                      NaN   \n",
+       "2                                                      NaN   \n",
+       "3                                                      NaN   \n",
+       "4                                                      NaN   \n",
+       "...                                                    ...   \n",
+       "2680483                                                NaN   \n",
+       "2680484                                                NaN   \n",
+       "2680485  [[institute of animal nutrition, master degree...   \n",
+       "2680486  [[richard gilder graduate school, phd in compa...   \n",
+       "2680487  [[school of electronics and information, maste...   \n",
+       "\n",
+       "                                                employment  n_works  \\\n",
+       "0        [[professor, peoples friendship university of ...        0   \n",
+       "1        [[research scientist, new york university abu ...        0   \n",
+       "2        [[researcher (academic), universidad de zarago...        0   \n",
+       "3        [[, kth royal institute of technology, stockho...        0   \n",
+       "4        [[, universidad de córdoba, córdoba, andalucía...        0   \n",
+       "...                                                    ...      ...   \n",
+       "2680483  [[graduate teaching assistant, university of p...        0   \n",
+       "2680484  [[post-doc, institute of biochemistry and cell...        2   \n",
+       "2680485  [[master, sichuan agricultural university , ch...        0   \n",
+       "2680486  [[assistant professor, baruch college, city un...        7   \n",
+       "2680487  [[lecturer, henan institute of science and tec...        0   \n",
+       "\n",
+       "                                              works_source  \\\n",
+       "0                                                      NaN   \n",
+       "1                                                      NaN   \n",
+       "2                                                      NaN   \n",
+       "3                                                      NaN   \n",
+       "4                                                      NaN   \n",
+       "...                                                    ...   \n",
+       "2680483                                                NaN   \n",
+       "2680484                      [scopus - elsevier, crossref]   \n",
+       "2680485                                                NaN   \n",
+       "2680486  [crossref metadata search, zachary t. calamari...   \n",
+       "2680487                                                NaN   \n",
+       "\n",
+       "                  activation_date          last_update_date  n_doi  n_arxiv  \\\n",
+       "0        2018-04-03t07:50:23.358z  2020-03-18t09:42:44.753z      0        0   \n",
+       "1        2015-08-18t12:36:45.307z  2020-09-23t13:37:54.180z      0        0   \n",
+       "2        2014-03-10t13:22:01.966z  2016-06-14t22:17:54.470z      0        0   \n",
+       "3        2015-01-11t15:13:06.467z  2016-06-14t23:55:59.896z      0        0   \n",
+       "4        2014-05-26t08:57:12.661z  2019-03-27t07:53:48.987z      0        0   \n",
+       "...                           ...                       ...    ...      ...   \n",
+       "2680483  2016-03-07t08:53:06.561z  2020-12-02t02:14:50.213z      0        0   \n",
+       "2680484  2015-10-24t03:53:23.544z  2020-11-19t09:23:48.896z      2        0   \n",
+       "2680485  2020-12-11t02:11:51.808z  2020-12-11t03:25:28.263z      0        0   \n",
+       "2680486  2015-01-20t20:20:17.042z  2020-11-21t19:48:36.221z      7        0   \n",
+       "2680487  2016-12-27t07:45:25.073z  2020-11-29t13:06:17.582z      0        0   \n",
+       "\n",
+       "         n_pmc  n_other_pids  label primary_email_domain other_email_domains  \\\n",
+       "0            0             0  False                  NaN                 NaN   \n",
+       "1            0             0  False                  NaN                 NaN   \n",
+       "2            0             0  False                  NaN                 NaN   \n",
+       "3            0             0  False                  NaN                 NaN   \n",
+       "4            0             0  False                  NaN                 NaN   \n",
+       "...        ...           ...    ...                  ...                 ...   \n",
+       "2680483      0             0  False                  NaN                 NaN   \n",
+       "2680484      0             1   True                  NaN                 NaN   \n",
+       "2680485      0             0  False                  NaN                 NaN   \n",
+       "2680486      1             0   True                  NaN                 NaN   \n",
+       "2680487      0             0  False                  NaN                 NaN   \n",
+       "\n",
+       "        url_domains  n_emails  n_urls  n_ids  n_keywords  n_education  \\\n",
+       "0               NaN      <NA>    <NA>   <NA>        <NA>         <NA>   \n",
+       "1               NaN      <NA>    <NA>   <NA>        <NA>         <NA>   \n",
+       "2               NaN      <NA>    <NA>   <NA>        <NA>         <NA>   \n",
+       "3          [kth.se]      <NA>       1   <NA>        <NA>         <NA>   \n",
+       "4               NaN      <NA>    <NA>      1           4         <NA>   \n",
+       "...             ...       ...     ...    ...         ...          ...   \n",
+       "2680483         NaN      <NA>    <NA>   <NA>           1         <NA>   \n",
+       "2680484         NaN      <NA>    <NA>   <NA>        <NA>         <NA>   \n",
+       "2680485         NaN      <NA>    <NA>   <NA>        <NA>            2   \n",
+       "2680486         NaN      <NA>    <NA>   <NA>        <NA>            2   \n",
+       "2680487         NaN      <NA>    <NA>   <NA>        <NA>            2   \n",
+       "\n",
+       "         n_employment                      ext_works_source  \\\n",
+       "0                   1                                   NaN   \n",
+       "1                   1                                   NaN   \n",
+       "2                   2                                   NaN   \n",
+       "3                   1                                   NaN   \n",
+       "4                   1                                   NaN   \n",
+       "...               ...                                   ...   \n",
+       "2680483             2                                   NaN   \n",
+       "2680484             1         [scopus - elsevier, crossref]   \n",
+       "2680485             1                                   NaN   \n",
+       "2680486             2  [crossref metadata search, crossref]   \n",
+       "2680487             1                                   NaN   \n",
+       "\n",
+       "         n_ext_work_source authoritative  spam_score  n_valid_employment  \n",
+       "0                      NaN         False         NaN                   1  \n",
+       "1                      NaN         False         NaN                   0  \n",
+       "2                      NaN         False         NaN                   1  \n",
+       "3                      NaN         False         NaN                   0  \n",
+       "4                      NaN         False         NaN                   1  \n",
+       "...                    ...           ...         ...                 ...  \n",
+       "2680483                NaN         False         NaN                   2  \n",
+       "2680484                2.0          True         NaN                   1  \n",
+       "2680485                NaN         False    0.044752                   1  \n",
+       "2680486                2.0          True         NaN                   0  \n",
+       "2680487                NaN         False         NaN                   1  \n",
+       "\n",
+       "[2680488 rows x 35 columns]"
+      ]
+     },
+     "execution_count": 106,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "df = df.merge(exploded_employment.groupby('orcid').id.count().reset_index(), on='orcid')\n",
+    "df.rename(columns={'id': 'n_valid_employment'}, inplace=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 115,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>orcid</th>\n",
+       "      <th>verified_email</th>\n",
+       "      <th>verified_primary_email</th>\n",
+       "      <th>given_names</th>\n",
+       "      <th>family_name</th>\n",
+       "      <th>biography</th>\n",
+       "      <th>other_names</th>\n",
+       "      <th>primary_email</th>\n",
+       "      <th>keywords</th>\n",
+       "      <th>external_ids</th>\n",
+       "      <th>education</th>\n",
+       "      <th>employment</th>\n",
+       "      <th>n_works</th>\n",
+       "      <th>works_source</th>\n",
+       "      <th>activation_date</th>\n",
+       "      <th>last_update_date</th>\n",
+       "      <th>n_doi</th>\n",
+       "      <th>n_arxiv</th>\n",
+       "      <th>n_pmc</th>\n",
+       "      <th>n_other_pids</th>\n",
+       "      <th>label</th>\n",
+       "      <th>primary_email_domain</th>\n",
+       "      <th>other_email_domains</th>\n",
+       "      <th>url_domains</th>\n",
+       "      <th>n_emails</th>\n",
+       "      <th>n_urls</th>\n",
+       "      <th>n_ids</th>\n",
+       "      <th>n_keywords</th>\n",
+       "      <th>n_education</th>\n",
+       "      <th>n_employment</th>\n",
+       "      <th>ext_works_source</th>\n",
+       "      <th>n_ext_work_source</th>\n",
+       "      <th>authoritative</th>\n",
+       "      <th>spam_score</th>\n",
+       "      <th>n_valid_employment</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>0000-0001-6220-5683</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[research scientist, new york university abu ...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2015-08-18t12:36:45.307z</td>\n",
+       "      <td>2020-09-23t13:37:54.180z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>0000-0001-7071-8294</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[researcher (academic), universidad de zarago...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2014-03-10t13:22:01.966z</td>\n",
+       "      <td>2016-06-14t22:17:54.470z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>0000-0001-7402-0096</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[, kth royal institute of technology, stockho...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2015-01-11t15:13:06.467z</td>\n",
+       "      <td>2016-06-14t23:55:59.896z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[kth.se]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>0000-0001-8377-3508</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[fontana, milena da silva]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[educação; informática; matemática.]</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[, instituto federal de educação, ciência e t...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2018-05-23t23:39:04.534z</td>\n",
+       "      <td>2019-10-16t02:50:11.007z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[cnpq.br]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>3</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>0000-0002-6508-6998</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[researcher (academic), universidad de zarago...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2014-03-12t08:23:22.492z</td>\n",
+       "      <td>2015-07-27t15:51:38.411z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
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+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680476</th>\n",
+       "      <td>0000-0001-9133-2366</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>søren</td>\n",
+       "      <td>staugaard</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[, , aarhus universitet, aarhus, , dk, 1006, ...</td>\n",
+       "      <td>[[, aarhus university, aarhus c, , dk, , ], [s...</td>\n",
+       "      <td>29</td>\n",
+       "      <td>[aarhus university, crossref]</td>\n",
+       "      <td>2013-03-19t11:34:48.477z</td>\n",
+       "      <td>2020-12-07t08:03:23.190z</td>\n",
+       "      <td>14</td>\n",
+       "      <td>0</td>\n",
+       "      <td>10</td>\n",
+       "      <td>35</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[au.dk, au.dk]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>3</td>\n",
+       "      <td>[aarhus university, crossref]</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680477</th>\n",
+       "      <td>0000-0001-8494-2123</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>tarun</td>\n",
+       "      <td>jain</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[pet/ct specialist; nuclear medicine physician...</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[assistant professor, mahatma gandhi medical ...</td>\n",
+       "      <td>0</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>2014-12-19t08:21:46.292z</td>\n",
+       "      <td>2020-12-09t06:03:57.055z</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>5</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>4</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680479</th>\n",
+       "      <td>0000-0002-2906-0299</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>tiffany</td>\n",
+       "      <td>mackay</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[tiffany russel sia]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>[microfluidics, gpc-1, gallium-67, pet/ct, oxy...</td>\n",
+       "      <td>[[researcherid, a-2121-2017]]</td>\n",
+       "      <td>[[faculty of medicine, master in pharmaceutica...</td>\n",
+       "      <td>[[clinical project lead, minomic international...</td>\n",
+       "      <td>11</td>\n",
+       "      <td>[crossref, researcherid, tiffany mackay]</td>\n",
+       "      <td>2017-01-03t23:28:48.736z</td>\n",
+       "      <td>2020-12-09t17:12:20.326z</td>\n",
+       "      <td>11</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[oxytocin.com.au, linkedin.com]</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>1</td>\n",
+       "      <td>13</td>\n",
+       "      <td>2</td>\n",
+       "      <td>4</td>\n",
+       "      <td>[crossref, researcherid]</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680481</th>\n",
+       "      <td>0000-0002-4422-4036</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>vijay</td>\n",
+       "      <td>krishnan</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[psychiatry, md, all india institute of medic...</td>\n",
+       "      <td>[[assistant professor, all india institute of ...</td>\n",
+       "      <td>2</td>\n",
+       "      <td>[crossref]</td>\n",
+       "      <td>2015-05-28t17:24:39.519z</td>\n",
+       "      <td>2020-11-24t08:57:22.875z</td>\n",
+       "      <td>2</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>False</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>5</td>\n",
+       "      <td>[crossref]</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>3</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2680486</th>\n",
+       "      <td>0000-0002-3800-6331</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>zachary</td>\n",
+       "      <td>calamari</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[richard gilder graduate school, phd in compa...</td>\n",
+       "      <td>[[assistant professor, baruch college, city un...</td>\n",
+       "      <td>7</td>\n",
+       "      <td>[crossref metadata search, zachary t. calamari...</td>\n",
+       "      <td>2015-01-20t20:20:17.042z</td>\n",
+       "      <td>2020-11-21t19:48:36.221z</td>\n",
+       "      <td>7</td>\n",
+       "      <td>0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2</td>\n",
+       "      <td>[crossref metadata search, crossref]</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>1036967 rows × 35 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                       orcid  verified_email  verified_primary_email  \\\n",
+       "1        0000-0001-6220-5683            True                    True   \n",
+       "2        0000-0001-7071-8294            True                    True   \n",
+       "3        0000-0001-7402-0096            True                    True   \n",
+       "5        0000-0001-8377-3508            True                    True   \n",
+       "8        0000-0002-6508-6998            True                    True   \n",
+       "...                      ...             ...                     ...   \n",
+       "2680476  0000-0001-9133-2366            True                    True   \n",
+       "2680477  0000-0001-8494-2123            True                    True   \n",
+       "2680479  0000-0002-2906-0299            True                    True   \n",
+       "2680481  0000-0002-4422-4036            True                    True   \n",
+       "2680486  0000-0002-3800-6331            True                    True   \n",
+       "\n",
+       "        given_names family_name biography                 other_names  \\\n",
+       "1              <NA>        <NA>      <NA>                         NaN   \n",
+       "2              <NA>        <NA>      <NA>                         NaN   \n",
+       "3              <NA>        <NA>      <NA>                         NaN   \n",
+       "5              <NA>        <NA>      <NA>  [fontana, milena da silva]   \n",
+       "8              <NA>        <NA>      <NA>                         NaN   \n",
+       "...             ...         ...       ...                         ...   \n",
+       "2680476       søren   staugaard      <NA>                         NaN   \n",
+       "2680477       tarun        jain      <NA>                         NaN   \n",
+       "2680479     tiffany      mackay      <NA>        [tiffany russel sia]   \n",
+       "2680481       vijay    krishnan      <NA>                         NaN   \n",
+       "2680486     zachary    calamari      <NA>                         NaN   \n",
+       "\n",
+       "        primary_email                                           keywords  \\\n",
+       "1                <NA>                                                NaN   \n",
+       "2                <NA>                                                NaN   \n",
+       "3                <NA>                                                NaN   \n",
+       "5                <NA>               [educação; informática; matemática.]   \n",
+       "8                <NA>                                                NaN   \n",
+       "...               ...                                                ...   \n",
+       "2680476          <NA>                                                NaN   \n",
+       "2680477          <NA>  [pet/ct specialist; nuclear medicine physician...   \n",
+       "2680479          <NA>  [microfluidics, gpc-1, gallium-67, pet/ct, oxy...   \n",
+       "2680481          <NA>                                                NaN   \n",
+       "2680486          <NA>                                                NaN   \n",
+       "\n",
+       "                          external_ids  \\\n",
+       "1                                  NaN   \n",
+       "2                                  NaN   \n",
+       "3                                  NaN   \n",
+       "5                                  NaN   \n",
+       "8                                  NaN   \n",
+       "...                                ...   \n",
+       "2680476                            NaN   \n",
+       "2680477                            NaN   \n",
+       "2680479  [[researcherid, a-2121-2017]]   \n",
+       "2680481                            NaN   \n",
+       "2680486                            NaN   \n",
+       "\n",
+       "                                                 education  \\\n",
+       "1                                                      NaN   \n",
+       "2                                                      NaN   \n",
+       "3                                                      NaN   \n",
+       "5                                                      NaN   \n",
+       "8                                                      NaN   \n",
+       "...                                                    ...   \n",
+       "2680476  [[, , aarhus universitet, aarhus, , dk, 1006, ...   \n",
+       "2680477                                                NaN   \n",
+       "2680479  [[faculty of medicine, master in pharmaceutica...   \n",
+       "2680481  [[psychiatry, md, all india institute of medic...   \n",
+       "2680486  [[richard gilder graduate school, phd in compa...   \n",
+       "\n",
+       "                                                employment  n_works  \\\n",
+       "1        [[research scientist, new york university abu ...        0   \n",
+       "2        [[researcher (academic), universidad de zarago...        0   \n",
+       "3        [[, kth royal institute of technology, stockho...        0   \n",
+       "5        [[, instituto federal de educação, ciência e t...        0   \n",
+       "8        [[researcher (academic), universidad de zarago...        0   \n",
+       "...                                                    ...      ...   \n",
+       "2680476  [[, aarhus university, aarhus c, , dk, , ], [s...       29   \n",
+       "2680477  [[assistant professor, mahatma gandhi medical ...        0   \n",
+       "2680479  [[clinical project lead, minomic international...       11   \n",
+       "2680481  [[assistant professor, all india institute of ...        2   \n",
+       "2680486  [[assistant professor, baruch college, city un...        7   \n",
+       "\n",
+       "                                              works_source  \\\n",
+       "1                                                      NaN   \n",
+       "2                                                      NaN   \n",
+       "3                                                      NaN   \n",
+       "5                                                      NaN   \n",
+       "8                                                      NaN   \n",
+       "...                                                    ...   \n",
+       "2680476                      [aarhus university, crossref]   \n",
+       "2680477                                                NaN   \n",
+       "2680479           [crossref, researcherid, tiffany mackay]   \n",
+       "2680481                                         [crossref]   \n",
+       "2680486  [crossref metadata search, zachary t. calamari...   \n",
+       "\n",
+       "                  activation_date          last_update_date  n_doi  n_arxiv  \\\n",
+       "1        2015-08-18t12:36:45.307z  2020-09-23t13:37:54.180z      0        0   \n",
+       "2        2014-03-10t13:22:01.966z  2016-06-14t22:17:54.470z      0        0   \n",
+       "3        2015-01-11t15:13:06.467z  2016-06-14t23:55:59.896z      0        0   \n",
+       "5        2018-05-23t23:39:04.534z  2019-10-16t02:50:11.007z      0        0   \n",
+       "8        2014-03-12t08:23:22.492z  2015-07-27t15:51:38.411z      0        0   \n",
+       "...                           ...                       ...    ...      ...   \n",
+       "2680476  2013-03-19t11:34:48.477z  2020-12-07t08:03:23.190z     14        0   \n",
+       "2680477  2014-12-19t08:21:46.292z  2020-12-09t06:03:57.055z      0        0   \n",
+       "2680479  2017-01-03t23:28:48.736z  2020-12-09t17:12:20.326z     11        0   \n",
+       "2680481  2015-05-28t17:24:39.519z  2020-11-24t08:57:22.875z      2        0   \n",
+       "2680486  2015-01-20t20:20:17.042z  2020-11-21t19:48:36.221z      7        0   \n",
+       "\n",
+       "         n_pmc  n_other_pids  label primary_email_domain other_email_domains  \\\n",
+       "1            0             0  False                  NaN                 NaN   \n",
+       "2            0             0  False                  NaN                 NaN   \n",
+       "3            0             0  False                  NaN                 NaN   \n",
+       "5            0             0  False                  NaN                 NaN   \n",
+       "8            0             0  False                  NaN                 NaN   \n",
+       "...        ...           ...    ...                  ...                 ...   \n",
+       "2680476     10            35   True                  NaN                 NaN   \n",
+       "2680477      0             0  False                  NaN                 NaN   \n",
+       "2680479      0             0   True                  NaN                 NaN   \n",
+       "2680481      0             0  False                  NaN                 NaN   \n",
+       "2680486      1             0   True                  NaN                 NaN   \n",
+       "\n",
+       "                             url_domains  n_emails  n_urls  n_ids  n_keywords  \\\n",
+       "1                                    NaN      <NA>    <NA>   <NA>        <NA>   \n",
+       "2                                    NaN      <NA>    <NA>   <NA>        <NA>   \n",
+       "3                               [kth.se]      <NA>       1   <NA>        <NA>   \n",
+       "5                              [cnpq.br]      <NA>       1   <NA>           1   \n",
+       "8                                    NaN      <NA>    <NA>   <NA>        <NA>   \n",
+       "...                                  ...       ...     ...    ...         ...   \n",
+       "2680476                   [au.dk, au.dk]      <NA>       2   <NA>        <NA>   \n",
+       "2680477                              NaN      <NA>    <NA>   <NA>           1   \n",
+       "2680479  [oxytocin.com.au, linkedin.com]      <NA>       2      1          13   \n",
+       "2680481                              NaN      <NA>    <NA>   <NA>        <NA>   \n",
+       "2680486                              NaN      <NA>    <NA>   <NA>        <NA>   \n",
+       "\n",
+       "         n_education  n_employment                      ext_works_source  \\\n",
+       "1               <NA>             1                                   NaN   \n",
+       "2               <NA>             2                                   NaN   \n",
+       "3               <NA>             1                                   NaN   \n",
+       "5               <NA>             3                                   NaN   \n",
+       "8               <NA>             2                                   NaN   \n",
+       "...              ...           ...                                   ...   \n",
+       "2680476            1             3         [aarhus university, crossref]   \n",
+       "2680477         <NA>             5                                   NaN   \n",
+       "2680479            2             4              [crossref, researcherid]   \n",
+       "2680481            2             5                            [crossref]   \n",
+       "2680486            2             2  [crossref metadata search, crossref]   \n",
+       "\n",
+       "         n_ext_work_source authoritative  spam_score  n_valid_employment  \n",
+       "1                      NaN         False         NaN                   0  \n",
+       "2                      NaN         False         NaN                   1  \n",
+       "3                      NaN         False         NaN                   0  \n",
+       "5                      NaN         False         NaN                   0  \n",
+       "8                      NaN         False         NaN                   1  \n",
+       "...                    ...           ...         ...                 ...  \n",
+       "2680476                2.0          True         NaN                   1  \n",
+       "2680477                NaN         False         NaN                   4  \n",
+       "2680479                2.0          True         NaN                   1  \n",
+       "2680481                1.0          True         NaN                   3  \n",
+       "2680486                2.0          True         NaN                   0  \n",
+       "\n",
+       "[1036967 rows x 35 columns]"
+      ]
+     },
+     "execution_count": 115,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "df[df.n_employment != df.n_valid_employment]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -15610,7 +18509,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 59,
+   "execution_count": 63,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -15619,7 +18518,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": 64,
    "metadata": {},
    "outputs": [
     {
@@ -15632,7 +18531,7 @@
        "Name: biography, dtype: object"
       ]
      },
-     "execution_count": 60,
+     "execution_count": 64,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -15643,7 +18542,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 61,
+   "execution_count": 65,
    "metadata": {},
    "outputs": [
     {
@@ -15857,7 +18756,7 @@
        "      <td>car title loans are a more straightforward way...</td>\n",
        "      <td>[loan agency]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[title loan on car, car title loan north ogden...</td>\n",
+       "      <td>[refinance car title loan, title loan on car, ...</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
@@ -16162,7 +19061,7 @@
        "51307                             [car title loan saratoga]          NaN   \n",
        "106024                         [car title loan victorville]          NaN   \n",
        "108770                                                  NaN          NaN   \n",
-       "108771    [title loan on car, car title loan north ogden...          NaN   \n",
+       "108771    [refinance car title loan, title loan on car, ...          NaN   \n",
        "...                                                     ...          ...   \n",
        "10875416                            [car title loan clovis]          NaN   \n",
        "10878239                         [car title loan escondido]          NaN   \n",
@@ -16251,7 +19150,7 @@
        "[421 rows x 33 columns]"
       ]
      },
-     "execution_count": 61,
+     "execution_count": 65,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -16262,7 +19161,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 62,
+   "execution_count": 66,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -16275,7 +19174,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 63,
+   "execution_count": 67,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -16284,7 +19183,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 64,
+   "execution_count": 68,
    "metadata": {},
    "outputs": [
     {
@@ -16390,7 +19289,7 @@
        "[348 rows x 2 columns]"
       ]
      },
-     "execution_count": 64,
+     "execution_count": 68,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -16401,7 +19300,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 65,
+   "execution_count": 69,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -16410,7 +19309,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 66,
+   "execution_count": 70,
    "metadata": {},
    "outputs": [
     {
@@ -16427,7 +19326,7 @@
        "Name: spam_score, dtype: float64"
       ]
      },
-     "execution_count": 66,
+     "execution_count": 70,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -16438,7 +19337,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 67,
+   "execution_count": 71,
    "metadata": {},
    "outputs": [
     {
@@ -16544,7 +19443,7 @@
        "[120733 rows x 2 columns]"
       ]
      },
-     "execution_count": 67,
+     "execution_count": 71,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -16553,6 +19452,13 @@
     "df[df.spam_score > 0.9999][['biography', 'spam_score']]"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "TODO: offending words, sexually explicit content"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -16562,36 +19468,1341 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 71,
+   "execution_count": 136,
    "metadata": {},
    "outputs": [
     {
-     "ename": "ValueError",
-     "evalue": "Cannot set non-string value '-1' into a StringArray.",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-71-3eb96c162a92>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mfig\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mpx\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mimshow\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mdf\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mfillna\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mcorr\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      2\u001b[0m \u001b[0mfig\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mshow\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/frame.py\u001b[0m in \u001b[0;36mfillna\u001b[0;34m(self, value, method, axis, inplace, limit, downcast)\u001b[0m\n\u001b[1;32m   4460\u001b[0m         \u001b[0mdowncast\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mNone\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   4461\u001b[0m     ) -> Optional[DataFrame]:\n\u001b[0;32m-> 4462\u001b[0;31m         return super().fillna(\n\u001b[0m\u001b[1;32m   4463\u001b[0m             \u001b[0mvalue\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   4464\u001b[0m             \u001b[0mmethod\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mmethod\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/generic.py\u001b[0m in \u001b[0;36mfillna\u001b[0;34m(self, value, method, axis, inplace, limit, downcast)\u001b[0m\n\u001b[1;32m   6427\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   6428\u001b[0m             \u001b[0;32melif\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0mis_list_like\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 6429\u001b[0;31m                 new_data = self._mgr.fillna(\n\u001b[0m\u001b[1;32m   6430\u001b[0m                     \u001b[0mvalue\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlimit\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mlimit\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0minplace\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0minplace\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mdowncast\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mdowncast\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   6431\u001b[0m                 )\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/internals/managers.py\u001b[0m in \u001b[0;36mfillna\u001b[0;34m(self, value, limit, inplace, downcast)\u001b[0m\n\u001b[1;32m    619\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    620\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0mfillna\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlimit\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0minplace\u001b[0m\u001b[0;34m:\u001b[0m \u001b[0mbool\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mdowncast\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m->\u001b[0m \u001b[0;34m\"BlockManager\"\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 621\u001b[0;31m         return self.apply(\n\u001b[0m\u001b[1;32m    622\u001b[0m             \u001b[0;34m\"fillna\"\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mvalue\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlimit\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mlimit\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0minplace\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0minplace\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mdowncast\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mdowncast\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    623\u001b[0m         )\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/internals/managers.py\u001b[0m in \u001b[0;36mapply\u001b[0;34m(self, f, align_keys, ignore_failures, **kwargs)\u001b[0m\n\u001b[1;32m    425\u001b[0m                     \u001b[0mapplied\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mb\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mapply\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mf\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    426\u001b[0m                 \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 427\u001b[0;31m                     \u001b[0mapplied\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mgetattr\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mb\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mf\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    428\u001b[0m             \u001b[0;32mexcept\u001b[0m \u001b[0;34m(\u001b[0m\u001b[0mTypeError\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mNotImplementedError\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    429\u001b[0m                 \u001b[0;32mif\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0mignore_failures\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/internals/blocks.py\u001b[0m in \u001b[0;36mfillna\u001b[0;34m(self, value, limit, inplace, downcast)\u001b[0m\n\u001b[1;32m   1916\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0mfillna\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlimit\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mNone\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0minplace\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mFalse\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mdowncast\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mNone\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1917\u001b[0m         \u001b[0mvalues\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mvalues\u001b[0m \u001b[0;32mif\u001b[0m \u001b[0minplace\u001b[0m \u001b[0;32melse\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mvalues\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mcopy\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 1918\u001b[0;31m         \u001b[0mvalues\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mvalues\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mfillna\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlimit\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mlimit\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   1919\u001b[0m         return [\n\u001b[1;32m   1920\u001b[0m             self.make_block_same_class(\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/arrays/_mixins.py\u001b[0m in \u001b[0;36mfillna\u001b[0;34m(self, value, method, limit)\u001b[0m\n\u001b[1;32m    260\u001b[0m                 \u001b[0;31m# fill with value\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    261\u001b[0m                 \u001b[0mnew_values\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mcopy\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 262\u001b[0;31m                 \u001b[0mnew_values\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mmask\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mvalue\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    263\u001b[0m         \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    264\u001b[0m             \u001b[0mnew_values\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mcopy\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-      "\u001b[0;32m~/.virtualenvs/data-science/lib/python3.8/site-packages/pandas/core/arrays/string_.py\u001b[0m in \u001b[0;36m__setitem__\u001b[0;34m(self, key, value)\u001b[0m\n\u001b[1;32m    273\u001b[0m                 \u001b[0mvalue\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mStringDtype\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mna_value\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    274\u001b[0m             \u001b[0;32melif\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0misinstance\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mvalue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mstr\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 275\u001b[0;31m                 raise ValueError(\n\u001b[0m\u001b[1;32m    276\u001b[0m                     \u001b[0;34mf\"Cannot set non-string value '{value}' into a StringArray.\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    277\u001b[0m                 )\n",
-      "\u001b[0;31mValueError\u001b[0m: Cannot set non-string value '-1' into a StringArray."
-     ]
+     "data": {
+      "application/vnd.plotly.v1+json": {
+       "config": {
+        "plotlyServerURL": "https://plot.ly"
+       },
+       "data": [
+        {
+         "coloraxis": "coloraxis",
+         "hovertemplate": "x: %{x}<br>y: %{y}<br>color: %{z}<extra></extra>",
+         "name": "0",
+         "type": "heatmap",
+         "x": [
+          "verified_email",
+          "verified_primary_email",
+          "n_works",
+          "n_doi",
+          "n_arxiv",
+          "n_pmc",
+          "n_other_pids",
+          "label",
+          "n_emails",
+          "n_urls",
+          "n_ids",
+          "n_keywords",
+          "n_education",
+          "n_employment",
+          "n_ext_work_source",
+          "spam_score",
+          "n_valid_employment",
+          "n_valid_education"
+         ],
+         "xaxis": "x",
+         "y": [
+          "verified_email",
+          "verified_primary_email",
+          "n_works",
+          "n_doi",
+          "n_arxiv",
+          "n_pmc",
+          "n_other_pids",
+          "label",
+          "n_emails",
+          "n_urls",
+          "n_ids",
+          "n_keywords",
+          "n_education",
+          "n_employment",
+          "n_ext_work_source",
+          "spam_score",
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+          "n_valid_education"
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+         "yaxis": "y",
+         "z": [
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\"constrain\": \"domain\", \"domain\": [0.0, 1.0]}},                        {\"responsive\": true}                    ).then(function(){\n",
+       "                            \n",
+       "var gd = document.getElementById('c86ee1c6-efb8-4f51-ab18-2bad80ee1cf5');\n",
+       "var x = new MutationObserver(function (mutations, observer) {{\n",
+       "        var display = window.getComputedStyle(gd).display;\n",
+       "        if (!display || display === 'none') {{\n",
+       "            console.log([gd, 'removed!']);\n",
+       "            Plotly.purge(gd);\n",
+       "            observer.disconnect();\n",
+       "        }}\n",
+       "}});\n",
+       "\n",
+       "// Listen for the removal of the full notebook cells\n",
+       "var notebookContainer = gd.closest('#notebook-container');\n",
+       "if (notebookContainer) {{\n",
+       "    x.observe(notebookContainer, {childList: true});\n",
+       "}}\n",
+       "\n",
+       "// Listen for the clearing of the current output cell\n",
+       "var outputEl = gd.closest('.output');\n",
+       "if (outputEl) {{\n",
+       "    x.observe(outputEl, {childList: true});\n",
+       "}}\n",
+       "\n",
+       "                        })                };                });            </script>        </div>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
     }
    ],
    "source": [
-    "fig = px.imshow(df[[]].fillna(-1).corr())\n",
+    "fig = px.imshow(df.select_dtypes(include=['bool','number']).fillna(-1).corr())\n",
     "fig.show()"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 74,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -16620,7 +20831,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 70,
+   "execution_count": 75,
    "metadata": {},
    "outputs": [
     {
@@ -16904,6 +21115,43 @@
        "      <td>...</td>\n",
        "    </tr>\n",
        "    <tr>\n",
+       "      <th>10989635</th>\n",
+       "      <td>0000-0002-7340-9697</td>\n",
+       "      <td>True</td>\n",
+       "      <td>True</td>\n",
+       "      <td>tawanda</td>\n",
+       "      <td>marandure</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>[[scopus author id, 48261373600]]</td>\n",
+       "      <td>[[animal science, msc sustainable agriculture,...</td>\n",
+       "      <td>[[lecturer, zimbabwe open university faculty o...</td>\n",
+       "      <td>7</td>\n",
+       "      <td>[scopus - elsevier]</td>\n",
+       "      <td>2015-11-05t08:52:08.743z</td>\n",
+       "      <td>2020-12-09t17:59:18.350z</td>\n",
+       "      <td>7</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>7</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>1</td>\n",
+       "      <td>&lt;NA&gt;</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3</td>\n",
+       "      <td>[scopus - elsevier]</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>True</td>\n",
+       "      <td>NaN</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
        "      <th>10989636</th>\n",
        "      <td>0000-0002-2906-0299</td>\n",
        "      <td>True</td>\n",
@@ -16913,7 +21161,7 @@
        "      <td>&lt;NA&gt;</td>\n",
        "      <td>[tiffany russel sia]</td>\n",
        "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[gpc-1, cancer, immunohistochemistry, clinical...</td>\n",
+       "      <td>[microfluidics, gpc-1, gallium-67, pet/ct, oxy...</td>\n",
        "      <td>[[researcherid, a-2121-2017]]</td>\n",
        "      <td>[[faculty of medicine, master in pharmaceutica...</td>\n",
        "      <td>[[clinical project lead, minomic international...</td>\n",
@@ -16978,43 +21226,6 @@
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>10989640</th>\n",
-       "      <td>0000-0002-1070-2220</td>\n",
-       "      <td>True</td>\n",
-       "      <td>True</td>\n",
-       "      <td>vinicios</td>\n",
-       "      <td>santanna</td>\n",
-       "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[vinicios sant anna, vinicios sant anna, vinic...</td>\n",
-       "      <td>&lt;NA&gt;</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>[[scopus author id, 57201697952]]</td>\n",
-       "      <td>[[economics, ph.d., university of illinois at ...</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>1</td>\n",
-       "      <td>[crossref metadata search]</td>\n",
-       "      <td>2016-03-19t21:24:42.821z</td>\n",
-       "      <td>2020-12-10t16:34:09.722z</td>\n",
-       "      <td>1</td>\n",
-       "      <td>0</td>\n",
-       "      <td>0</td>\n",
-       "      <td>1</td>\n",
-       "      <td>True</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>[vpsantanna.com]</td>\n",
-       "      <td>&lt;NA&gt;</td>\n",
-       "      <td>1</td>\n",
-       "      <td>1</td>\n",
-       "      <td>&lt;NA&gt;</td>\n",
-       "      <td>2</td>\n",
-       "      <td>&lt;NA&gt;</td>\n",
-       "      <td>[crossref metadata search]</td>\n",
-       "      <td>1.0</td>\n",
-       "      <td>True</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
        "      <th>10989643</th>\n",
        "      <td>0000-0003-2606-0936</td>\n",
        "      <td>True</td>\n",
@@ -17090,7 +21301,7 @@
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n",
-       "<p>2664886 rows × 34 columns</p>\n",
+       "<p>2075872 rows × 34 columns</p>\n",
        "</div>"
       ],
       "text/plain": [
@@ -17101,50 +21312,37 @@
        "33        0000-0002-4447-9215            True                    True   \n",
        "44        0000-0003-0426-4065            True                    True   \n",
        "...                       ...             ...                     ...   \n",
+       "10989635  0000-0002-7340-9697            True                    True   \n",
        "10989636  0000-0002-2906-0299            True                    True   \n",
        "10989637  0000-0001-5896-2024            True                    True   \n",
-       "10989640  0000-0002-1070-2220            True                    True   \n",
        "10989643  0000-0003-2606-0936            True                    True   \n",
        "10989645  0000-0002-3800-6331            True                    True   \n",
        "\n",
-       "          given_names family_name biography  \\\n",
-       "17               <NA>        <NA>      <NA>   \n",
-       "19               <NA>        <NA>      <NA>   \n",
-       "22               <NA>        <NA>      <NA>   \n",
-       "33               <NA>        <NA>      <NA>   \n",
-       "44               <NA>        <NA>      <NA>   \n",
-       "...               ...         ...       ...   \n",
-       "10989636      tiffany      mackay      <NA>   \n",
-       "10989637  giovanni, l      tiscia      <NA>   \n",
-       "10989640     vinicios    santanna      <NA>   \n",
-       "10989643        luang          xu      <NA>   \n",
-       "10989645      zachary    calamari      <NA>   \n",
+       "          given_names family_name biography           other_names  \\\n",
+       "17               <NA>        <NA>      <NA>                   NaN   \n",
+       "19               <NA>        <NA>      <NA>                   NaN   \n",
+       "22               <NA>        <NA>      <NA>                   NaN   \n",
+       "33               <NA>        <NA>      <NA>                   NaN   \n",
+       "44               <NA>        <NA>      <NA>    [eliza i. gilbert]   \n",
+       "...               ...         ...       ...                   ...   \n",
+       "10989635      tawanda   marandure      <NA>                   NaN   \n",
+       "10989636      tiffany      mackay      <NA>  [tiffany russel sia]   \n",
+       "10989637  giovanni, l      tiscia      <NA>                   NaN   \n",
+       "10989643        luang          xu      <NA>    [xu lu-ang, lu lu]   \n",
+       "10989645      zachary    calamari      <NA>                   NaN   \n",
        "\n",
-       "                                                other_names primary_email  \\\n",
-       "17                                                      NaN          <NA>   \n",
-       "19                                                      NaN          <NA>   \n",
-       "22                                                      NaN          <NA>   \n",
-       "33                                                      NaN          <NA>   \n",
-       "44                                       [eliza i. gilbert]          <NA>   \n",
-       "...                                                     ...           ...   \n",
-       "10989636                               [tiffany russel sia]          <NA>   \n",
-       "10989637                                                NaN          <NA>   \n",
-       "10989640  [vinicios sant anna, vinicios sant anna, vinic...          <NA>   \n",
-       "10989643                                 [xu lu-ang, lu lu]          <NA>   \n",
-       "10989645                                                NaN          <NA>   \n",
-       "\n",
-       "                                                   keywords  \\\n",
-       "17                                                      NaN   \n",
-       "19                                                      NaN   \n",
-       "22                                                      NaN   \n",
-       "33                                                      NaN   \n",
-       "44                                                      NaN   \n",
-       "...                                                     ...   \n",
-       "10989636  [gpc-1, cancer, immunohistochemistry, clinical...   \n",
-       "10989637                                                NaN   \n",
-       "10989640                                                NaN   \n",
-       "10989643                                                NaN   \n",
-       "10989645                                                NaN   \n",
+       "         primary_email                                           keywords  \\\n",
+       "17                <NA>                                                NaN   \n",
+       "19                <NA>                                                NaN   \n",
+       "22                <NA>                                                NaN   \n",
+       "33                <NA>                                                NaN   \n",
+       "44                <NA>                                                NaN   \n",
+       "...                ...                                                ...   \n",
+       "10989635          <NA>                                                NaN   \n",
+       "10989636          <NA>  [microfluidics, gpc-1, gallium-67, pet/ct, oxy...   \n",
+       "10989637          <NA>                                                NaN   \n",
+       "10989643          <NA>                                                NaN   \n",
+       "10989645          <NA>                                                NaN   \n",
        "\n",
        "                               external_ids  \\\n",
        "17                                      NaN   \n",
@@ -17153,9 +21351,9 @@
        "33                                      NaN   \n",
        "44                                      NaN   \n",
        "...                                     ...   \n",
+       "10989635  [[scopus author id, 48261373600]]   \n",
        "10989636      [[researcherid, a-2121-2017]]   \n",
        "10989637  [[scopus author id, 54948242800]]   \n",
-       "10989640  [[scopus author id, 57201697952]]   \n",
        "10989643                                NaN   \n",
        "10989645                                NaN   \n",
        "\n",
@@ -17166,9 +21364,9 @@
        "33                                                      NaN   \n",
        "44                                                      NaN   \n",
        "...                                                     ...   \n",
+       "10989635  [[animal science, msc sustainable agriculture,...   \n",
        "10989636  [[faculty of medicine, master in pharmaceutica...   \n",
        "10989637                                                NaN   \n",
-       "10989640  [[economics, ph.d., university of illinois at ...   \n",
        "10989643                                                NaN   \n",
        "10989645  [[richard gilder graduate school, phd in compa...   \n",
        "\n",
@@ -17179,9 +21377,9 @@
        "33                                                      NaN        0   \n",
        "44        [[, us fish and wildlife service, albuquerque,...        0   \n",
        "...                                                     ...      ...   \n",
+       "10989635  [[lecturer, zimbabwe open university faculty o...        7   \n",
        "10989636  [[clinical project lead, minomic international...       11   \n",
        "10989637                                                NaN       70   \n",
-       "10989640                                                NaN        1   \n",
        "10989643  [[post-doc, institute of biochemistry and cell...        2   \n",
        "10989645  [[assistant professor, baruch college, city un...        7   \n",
        "\n",
@@ -17192,9 +21390,9 @@
        "33                                                      NaN   \n",
        "44                                                      NaN   \n",
        "...                                                     ...   \n",
+       "10989635                                [scopus - elsevier]   \n",
        "10989636           [crossref, researcherid, tiffany mackay]   \n",
        "10989637  [scopus - elsevier, tiscia giovanni, l, europe...   \n",
-       "10989640                         [crossref metadata search]   \n",
        "10989643                      [scopus - elsevier, crossref]   \n",
        "10989645  [crossref metadata search, zachary t. calamari...   \n",
        "\n",
@@ -17205,9 +21403,9 @@
        "33        2017-07-24t09:37:50.242z  2019-11-15t08:31:24.820z      0        0   \n",
        "44        2017-08-07t18:32:31.802z  2020-04-08t16:48:55.732z      0        0   \n",
        "...                            ...                       ...    ...      ...   \n",
+       "10989635  2015-11-05t08:52:08.743z  2020-12-09t17:59:18.350z      7        0   \n",
        "10989636  2017-01-03t23:28:48.736z  2020-12-09t17:12:20.326z     11        0   \n",
        "10989637  2016-07-27t10:09:13.585z  2020-12-07t22:23:05.706z     65        0   \n",
-       "10989640  2016-03-19t21:24:42.821z  2020-12-10t16:34:09.722z      1        0   \n",
        "10989643  2015-10-24t03:53:23.544z  2020-11-19t09:23:48.896z      2        0   \n",
        "10989645  2015-01-20t20:20:17.042z  2020-11-21t19:48:36.221z      7        0   \n",
        "\n",
@@ -17218,9 +21416,9 @@
        "33            0             0   True                  NaN                 NaN   \n",
        "44            0             0   True                  NaN                 NaN   \n",
        "...         ...           ...    ...                  ...                 ...   \n",
+       "10989635      0             7   True                  NaN                 NaN   \n",
        "10989636      0             0   True                  NaN                 NaN   \n",
        "10989637     17            52   True                  NaN                 NaN   \n",
-       "10989640      0             1   True                  NaN                 NaN   \n",
        "10989643      0             1   True                  NaN                 NaN   \n",
        "10989645      1             0   True                  NaN                 NaN   \n",
        "\n",
@@ -17231,9 +21429,9 @@
        "33                                    NaN      <NA>    <NA>   <NA>   \n",
        "44                                    NaN      <NA>    <NA>   <NA>   \n",
        "...                                   ...       ...     ...    ...   \n",
+       "10989635                              NaN      <NA>    <NA>      1   \n",
        "10989636  [oxytocin.com.au, linkedin.com]      <NA>       2      1   \n",
        "10989637                              NaN      <NA>    <NA>      1   \n",
-       "10989640                 [vpsantanna.com]      <NA>       1      1   \n",
        "10989643                              NaN      <NA>    <NA>   <NA>   \n",
        "10989645                              NaN      <NA>    <NA>   <NA>   \n",
        "\n",
@@ -17244,9 +21442,9 @@
        "33              <NA>         <NA>          <NA>   \n",
        "44              <NA>         <NA>             1   \n",
        "...              ...          ...           ...   \n",
+       "10989635        <NA>            3             3   \n",
        "10989636          13            2             4   \n",
        "10989637        <NA>         <NA>          <NA>   \n",
-       "10989640        <NA>            2          <NA>   \n",
        "10989643        <NA>         <NA>             1   \n",
        "10989645        <NA>            2             2   \n",
        "\n",
@@ -17257,9 +21455,9 @@
        "33                                                      NaN   \n",
        "44                                                      NaN   \n",
        "...                                                     ...   \n",
+       "10989635                                [scopus - elsevier]   \n",
        "10989636                           [crossref, researcherid]   \n",
        "10989637  [scopus - elsevier, europe pubmed central, cro...   \n",
-       "10989640                         [crossref metadata search]   \n",
        "10989643                      [scopus - elsevier, crossref]   \n",
        "10989645               [crossref metadata search, crossref]   \n",
        "\n",
@@ -17270,16 +21468,16 @@
        "33                      NaN         False         NaN  \n",
        "44                      NaN         False         NaN  \n",
        "...                     ...           ...         ...  \n",
+       "10989635                1.0          True         NaN  \n",
        "10989636                2.0          True         NaN  \n",
        "10989637                3.0          True         NaN  \n",
-       "10989640                1.0          True         NaN  \n",
        "10989643                2.0          True         NaN  \n",
        "10989645                2.0          True         NaN  \n",
        "\n",
-       "[2664886 rows x 34 columns]"
+       "[2075872 rows x 34 columns]"
       ]
      },
-     "execution_count": 70,
+     "execution_count": 75,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -17290,7 +21488,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 76,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -17299,10 +21497,60 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 77,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'pandas.core.frame.DataFrame'>\n",
+      "RangeIndex: 10989649 entries, 0 to 10989648\n",
+      "Data columns (total 34 columns):\n",
+      " #   Column                  Dtype  \n",
+      "---  ------                  -----  \n",
+      " 0   orcid                   object \n",
+      " 1   verified_email          bool   \n",
+      " 2   verified_primary_email  bool   \n",
+      " 3   given_names             string \n",
+      " 4   family_name             string \n",
+      " 5   biography               string \n",
+      " 6   other_names             object \n",
+      " 7   primary_email           string \n",
+      " 8   keywords                object \n",
+      " 9   external_ids            object \n",
+      " 10  education               object \n",
+      " 11  employment              object \n",
+      " 12  n_works                 Int16  \n",
+      " 13  works_source            object \n",
+      " 14  activation_date         string \n",
+      " 15  last_update_date        string \n",
+      " 16  n_doi                   Int16  \n",
+      " 17  n_arxiv                 Int16  \n",
+      " 18  n_pmc                   Int16  \n",
+      " 19  n_other_pids            Int16  \n",
+      " 20  label                   bool   \n",
+      " 21  primary_email_domain    object \n",
+      " 22  other_email_domains     object \n",
+      " 23  url_domains             object \n",
+      " 24  n_emails                Int16  \n",
+      " 25  n_urls                  Int16  \n",
+      " 26  n_ids                   Int16  \n",
+      " 27  n_keywords              Int16  \n",
+      " 28  n_education             Int16  \n",
+      " 29  n_employment            Int16  \n",
+      " 30  ext_works_source        object \n",
+      " 31  n_ext_work_source       float64\n",
+      " 32  authoritative           object \n",
+      " 33  spam_score              float64\n",
+      "dtypes: Int16(11), bool(3), float64(2), object(12), string(6)\n",
+      "memory usage: 2.0+ GB\n"
+     ]
+    }
+   ],
+   "source": [
+    "df.info()"
+   ]
   },
   {
    "cell_type": "code",