Google Scholar, Web of Science, and Scopus: A systematic comparison of citations in 252 subject categories

•Google Scholar found nearly all citations found by WoS (95%) and Scopus (92%), and a large amount of unique citations.•About half of Google Scholar unique citations are not from journals. A significant minority (19–38%) are not in English.•Google Scholar unique citations have, on average, a much lo...

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Published inJournal of informetrics Vol. 12; no. 4; pp. 1160 - 1177
Main Authors Martín-Martín, Alberto, Orduna-Malea, Enrique, Thelwall, Mike, Delgado López-Cózar, Emilio
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2018
Subjects
Online AccessGet full text
ISSN1751-1577
1875-5879
1875-5879
DOI10.1016/j.joi.2018.09.002

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Abstract •Google Scholar found nearly all citations found by WoS (95%) and Scopus (92%), and a large amount of unique citations.•About half of Google Scholar unique citations are not from journals. A significant minority (19–38%) are not in English.•Google Scholar unique citations have, on average, a much lower scientific impact than citations also found by WoS/Scopus.•Spearman correlations of citation counts between Google Scholar and WoS/Scopus are strong across all subjects (0.78–0.99). Despite citation counts from Google Scholar (GS), Web of Science (WoS), and Scopus being widely consulted by researchers and sometimes used in research evaluations, there is no recent or systematic evidence about the differences between them. In response, this paper investigates 2,448,055 citations to 2299 English-language highly-cited documents from 252 GS subject categories published in 2006, comparing GS, the WoS Core Collection, and Scopus. GS consistently found the largest percentage of citations across all areas (93%–96%), far ahead of Scopus (35%–77%) and WoS (27%–73%). GS found nearly all the WoS (95%) and Scopus (92%) citations. Most citations found only by GS were from non-journal sources (48%–65%), including theses, books, conference papers, and unpublished materials. Many were non-English (19%–38%), and they tended to be much less cited than citing sources that were also in Scopus or WoS. Despite the many unique GS citing sources, Spearman correlations between citation counts in GS and WoS or Scopus are high (0.78-0.99). They are lower in the Humanities, and lower between GS and WoS than between GS and Scopus. The results suggest that in all areas GS citation data is essentially a superset of WoS and Scopus, with substantial extra coverage.
AbstractList •Google Scholar found nearly all citations found by WoS (95%) and Scopus (92%), and a large amount of unique citations.•About half of Google Scholar unique citations are not from journals. A significant minority (19–38%) are not in English.•Google Scholar unique citations have, on average, a much lower scientific impact than citations also found by WoS/Scopus.•Spearman correlations of citation counts between Google Scholar and WoS/Scopus are strong across all subjects (0.78–0.99). Despite citation counts from Google Scholar (GS), Web of Science (WoS), and Scopus being widely consulted by researchers and sometimes used in research evaluations, there is no recent or systematic evidence about the differences between them. In response, this paper investigates 2,448,055 citations to 2299 English-language highly-cited documents from 252 GS subject categories published in 2006, comparing GS, the WoS Core Collection, and Scopus. GS consistently found the largest percentage of citations across all areas (93%–96%), far ahead of Scopus (35%–77%) and WoS (27%–73%). GS found nearly all the WoS (95%) and Scopus (92%) citations. Most citations found only by GS were from non-journal sources (48%–65%), including theses, books, conference papers, and unpublished materials. Many were non-English (19%–38%), and they tended to be much less cited than citing sources that were also in Scopus or WoS. Despite the many unique GS citing sources, Spearman correlations between citation counts in GS and WoS or Scopus are high (0.78-0.99). They are lower in the Humanities, and lower between GS and WoS than between GS and Scopus. The results suggest that in all areas GS citation data is essentially a superset of WoS and Scopus, with substantial extra coverage.
Author Delgado López-Cózar, Emilio
Orduna-Malea, Enrique
Martín-Martín, Alberto
Thelwall, Mike
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  givenname: Alberto
  orcidid: 0000-0002-0360-186X
  surname: Martín-Martín
  fullname: Martín-Martín, Alberto
  email: albertomartin@ugr.es
  organization: Facultad de Comunicación y Documentación, Universidad de Granada, Granada, Spain
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  givenname: Enrique
  orcidid: 0000-0002-1989-8477
  surname: Orduna-Malea
  fullname: Orduna-Malea, Enrique
  organization: Universitat Politècnica de València, Valencia, Spain
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  givenname: Mike
  orcidid: 0000-0001-6065-205X
  surname: Thelwall
  fullname: Thelwall, Mike
  organization: Statistical Cybermetrics Research Group, School of Mathematics and Computer Science, University of Wolverhampton, Wolverhampton, UK
– sequence: 4
  givenname: Emilio
  orcidid: 0000-0002-8184-551X
  surname: Delgado López-Cózar
  fullname: Delgado López-Cózar, Emilio
  organization: Facultad de Comunicación y Documentación, Universidad de Granada, Granada, Spain
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SSID ssj0056619
Score 2.6776714
Snippet •Google Scholar found nearly all citations found by WoS (95%) and Scopus (92%), and a large amount of unique citations.•About half of Google Scholar unique...
SourceID unpaywall
crossref
elsevier
SourceType Open Access Repository
Enrichment Source
Index Database
Publisher
StartPage 1160
SubjectTerms Academic search engines
Bibliographic databases
Bibliometrics
Citation analysis
Citation overlap
Coverage
Google Scholar
Scientometrics
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Title Google Scholar, Web of Science, and Scopus: A systematic comparison of citations in 252 subject categories
URI https://dx.doi.org/10.1016/j.joi.2018.09.002
http://hdl.handle.net/10251/154398
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