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Sub-field normalization in the multiplicative case : average-based citation indicators

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dc.affiliation.dptoUC3M. Departamento de Economíaes
dc.contributor.authorHerranz, Neus
dc.contributor.authorRuiz-Castillo, Javier
dc.contributor.editorUniversidad Carlos III de Madrid. Departamento de Economía
dc.date.accessioned2012-01-30T09:09:45Z
dc.date.available2012-01-30T09:09:45Z
dc.date.issued2012-01
dc.description.abstractThis paper investigates the citation impact of three large geographical areas –the U.S., the European Union (EU), and the rest of the world (RW)– at different aggregation levels. The difficulty is that 42% of the 3.6 million articles in our Thomson Scientific dataset are assigned to several sub-fields among a set of 219 Web of Science categories. We follow a multiplicative approach in which every article is wholly counted as many times as it appears at each aggregation level. We compute the crown indicator and the Mean Normalized Citation Score (MNCS) using for the first time sub-field normalization procedures for the multiplicative case. We also compute a third indicator that does not correct for differences in citation practices across sub-fields. It is found that: (1) No geographical area is systematically favored (or penalized) by any of the two normalized indicators. (2) According to the MNCS, only in six out of 80 disciplines –but in none of 20 fields– is the EU ahead of the U.S. In contrast, the normalized U.S./EU gap is greater than 20% in 44 disciplines, 13 fields, and for all sciences as a whole. The dominance of the EU over the RW is even greater. (3) The U.S. appears to devote relatively more –and the RW less– publication effort to subfields with a high mean citation rate, which explains why the U.S./EU and EU/RW gaps for all sciences as a whole increase by 4.5 and 5.6 percentage points in the un-normalized case. The results with a fractional approach are very similar indeed
dc.description.sponsorshipFinancial support from the Santander Universities Global Division of Banco Santander. Ruiz-Castillo also acknowledges financial help from the Spanish MEC through grant SEJ2007-67436
dc.description.sponsorshipEuropean Community's Seventh Framework Program
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.identifier.issn2340-5031
dc.identifier.repecwe1130
dc.identifier.urihttps://hdl.handle.net/10016/12290
dc.identifier.uxxiDT/0000000852
dc.language.isoeng
dc.relation.ispartofseriesUC3M Working papers. Economics
dc.relation.ispartofseries11-30
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/217436
dc.relation.projectIDGobierno de España. SEJ2007-67436
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.ecienciaEconomía
dc.titleSub-field normalization in the multiplicative case : average-based citation indicators
dc.typeworking paper*
dc.type.hasVersionSMUR*
dspace.entity.typePublication
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