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

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

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dc.contributor.author Martín-Martín, Alberto es_ES
dc.contributor.author Orduña-Malea, Enrique es_ES
dc.contributor.author Thelwall, Mike es_ES
dc.contributor.author Delgado Lopez-Cozar, Emilio es_ES
dc.date.accessioned 2020-11-07T04:33:02Z
dc.date.available 2020-11-07T04:33:02Z
dc.date.issued 2018-11 es_ES
dc.identifier.issn 1751-1577 es_ES
dc.identifier.uri http://hdl.handle.net/10251/154398
dc.description.abstract [EN] 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citations found only by GS were from non-journal sources (48%¿65%), including theses, books, conference papers, and unpublished materials.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. es_ES
dc.description.sponsorship Alberto Martin-Martin is funded for a four-year doctoral fellowship (FPU2013/05863) granted by the Ministerio de Educacion, Cultura, y Deportes (Spain). An international mobility grant from Universidad de Granada and CEI BioTic Granadafunded a research stay at the University of Wolverhampton. es_ES
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation MECD/FPU2013/05863 es_ES
dc.relation.ispartof Journal of Informetrics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Google Scholar es_ES
dc.subject Web of Science es_ES
dc.subject Scopus es_ES
dc.subject Bibliographic databases es_ES
dc.subject Academic search engines es_ES
dc.subject Coverage es_ES
dc.subject Citation analysis es_ES
dc.subject Unique citations es_ES
dc.subject Citation overlap es_ES
dc.subject Bibliometrics es_ES
dc.subject Scientometrics es_ES
dc.subject.classification BIBLIOTECONOMIA Y DOCUMENTACION es_ES
dc.title Google Scholar, Web of Science, and Scopus: A systematic comparison of citations in 252 subject categories es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.joi.2018.09.002 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Comunicación Audiovisual, Documentación e Historia del Arte - Departament de Comunicació Audiovisual, Documentació i Història de l'Art es_ES
dc.description.bibliographicCitation Martín-Martín, A.; Orduña-Malea, E.; Thelwall, M.; Delgado Lopez-Cozar, E. (2018). Google Scholar, Web of Science, and Scopus: A systematic comparison of citations in 252 subject categories. Journal of Informetrics. 12(4):1160-1177. https://doi.org/10.1016/j.joi.2018.09.002 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion https://doi.org/10.1016/j.joi.2018.09.002 es_ES
dc.description.upvformatpinicio 1160 es_ES
dc.description.upvformatpfin 1177 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 12 es_ES
dc.description.issue 4 es_ES
dc.relation.pasarela S\374450 es_ES
dc.contributor.funder Ministerio de Educación, Cultura y Deporte es_ES


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