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Quantitative evaluation of alternative field normalization procedures

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  • Li, Yunrong
  • Radicchi, Filippo
  • Castellano, Claudio
  • Ruiz-Castillo, Javier

Abstract

Wide differences in publication and citation practices make impossible the direct comparison of raw citation counts across scientific disciplines. Recent research has studied new and traditional normalization procedures aimed at suppressing as much as possible these disproportions in citation numbers among scientific domains. Using the recently introduced IDCP (Inequality due to Differences in Citation Practices) method, this paper rigorously tests the performance of six cited-side normalization procedures based on the Thomson Reuters classification system consisting of 172 sub-fields. We use six yearly datasets from 1980 to 2004, with widely varying citation windows from the publication year to May 2011. The main findings are the following three. Firstly, as observed in previous research, within each year the shapes of sub-field citation distributions are strikingly similar. This paves the way for several normalization procedures to perform reasonably well in reducing the effect on citation inequality of differences in citation practices. Secondly, independently of the year of publication and the length of the citation window, the effect of such differences represents about 13% of total citation inequality. Thirdly, a recently introduced two-parameter normalization scheme outperforms the other normalization procedures over the entire period, reducing citation disproportions to a level very close to the minimum achievable given the data and the classification system. However, the traditional procedure of using sub-field mean citations as normalization factors yields also good results.

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Bibliographic Info

Article provided by Elsevier in its journal Journal of Informetrics.

Volume (Year): 7 (2013)
Issue (Month): 3 ()
Pages: 746-755

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Handle: RePEc:eee:infome:v:7:y:2013:i:3:p:746-755

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Web page: http://www.elsevier.com/locate/joi

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Keywords: Citation analysis; Citation practices; Normalization procedures; Citation inequality;

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References

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  1. Radicchi, Filippo & Castellano, Claudio, 2012. "Testing the fairness of citation indicators for comparison across scientific domains: The case of fractional citation counts," Journal of Informetrics, Elsevier, vol. 6(1), pages 121-130.
  2. Moed, H. F. & Burger, W. J. M. & Frankfort, J. G. & Van Raan, A. F. J., 1985. "The use of bibliometric data for the measurement of university research performance," Research Policy, Elsevier, vol. 14(3), pages 131-149, June.
  3. Moed, Henk F., 2010. "Measuring contextual citation impact of scientific journals," Journal of Informetrics, Elsevier, vol. 4(3), pages 265-277.
  4. Pedro Albarrán & Juan A. Crespo & Ignacio Ortuño & Javier Ruiz-Castillo, 2010. "The skewness of science in 219 sub-fields and a number of aggregates," Economics Working Papers we1038, Universidad Carlos III, Departamento de Economía.
  5. Yunrong Li & Javier Ruiz-Castillo, 2013. "The comparison of normalization procedures based on different classification systems," Economics Working Papers we1306, Universidad Carlos III, Departamento de Economía.
  6. Abramo, Giovanni & Cicero, Tindaro & D’Angelo, Ciriaco Andrea, 2012. "How important is choice of the scaling factor in standardizing citations?," Journal of Informetrics, Elsevier, vol. 6(4), pages 645-654.
  7. Davis, Paul & Papanek, Gustav F, 1984. "Faculty Ratings of Major Economics Departments by Citations," American Economic Review, American Economic Association, vol. 74(1), pages 225-30, March.
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Cited by:
  1. Javier Ruiz-Castillo, 2013. "The comparison of classification-system-based normalization procedures with source normalization alternatives in Waltman and Van Eck (2013)," Economics Working Papers we1318, Universidad Carlos III, Departamento de Economía.
  2. Javier Ruiz-Castillo Ucelay & Antonio Perianes-Rodríguez, 2014. "Within and across department variability in individual productivity : the case of economics," Economics Working Papers we1404, Universidad Carlos III, Departamento de Economía.
  3. Javier Ruiz-Castillo & Rodrigo Costas, 2014. "The skewness of scientific productivity," Economics Working Papers we1402, Universidad Carlos III, Departamento de Economía.
  4. Javier Ruiz-Castillo & Ludo Waltman, 2014. "Field-normalized citation impact indicators using algorithmically constructed classification systems of science," Economics Working Papers we1403, Universidad Carlos III, Departamento de Economía.

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