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

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dc.contributor.author Herranz, Neus
dc.contributor.author Ruiz-Castillo, Javier
dc.contributor.editor Universidad Carlos III de Madrid. Departamento de Economía
dc.date.accessioned 2012-01-30T09:09:45Z
dc.date.available 2012-01-30T09:09:45Z
dc.date.issued 2012-01
dc.identifier.issn 2340-5031
dc.identifier.uri http://hdl.handle.net/10016/12290
dc.description.abstract This 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.sponsorship Financial 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.sponsorship European Community's Seventh Framework Program
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso eng
dc.relation.ispartofseries UC3M Working papers. Economics
dc.relation.ispartofseries 11-30
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.title Sub-field normalization in the multiplicative case : average-based citation indicators
dc.type workingPaper
dc.subject.eciencia Economía
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/217436
dc.relation.projectID Gobierno de España. SEJ2007-67436
dc.type.version submittedVersion
dc.identifier.uxxi DT/0000000852
dc.identifier.repec we1130
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