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Multiplicative and fractional strategies when journals are assigned to several sub-fields

  • Herranz, Neus
  • Ruiz-Castillo, Javier

In many datasets, articles are classified into sub-fields through the journals in which they have been published. The problem is that many journals are assigned to a single sub-field, but many others are assigned to several sub-fields. This paper discusses a multiplicative and a fractional strategy to deal with this situation, and introduces a normalization procedure in the multiplicative case that takes into account differences in mean citation rates across sub-fields. The empirical part studies different aspects of citation distributions under the two strategies, namely: (i) the number of articles, (ii) the mean citation rate, (iii) the broad shape of the distribution, (iv) the characterization in terms of size- and scale-invariant indicators of high- and low-impact, and (v) the presence of extreme distributions, or distributions that behave very differently from the rest. It is found that, in spite of large differences in the number of articles according to both strategies, the similarity of the citation characteristics of articles published in journals assigned to one or several sub-fields guarantees that choosing one of the two strategies may not lead to a radically different picture in practical applications. Nevertheless, the evaluation of citation excellence through a high-impact indicator may considerably differ depending on that choice.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 8673.

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Date of creation: Nov 2011
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Handle: RePEc:cpr:ceprdp:8673
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  1. Albarrán, Pedro & Ortuño, Ignacio & Ruiz-Castillo, Javier, 2011. "The measurement of low- and high-impact in citation distributions: Technical results," Journal of Informetrics, Elsevier, vol. 5(1), pages 48-63.
  2. 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.
  3. Albarrán, Pedro & Ortuño-Ortín, Ignacio & Ruiz-Castillo, Javier, 2010. "High- and Low-Impact Citation Measures: Empirical Applications," CEPR Discussion Papers 7886, C.E.P.R. Discussion Papers.
  4. Ruiz-Castillo, Javier, 2011. "The Evaluation of Citation Distributions," CEPR Discussion Papers 8681, C.E.P.R. Discussion Papers.
  5. Neus Herranz & Javier Ruiz-Castillo, 2011. "The end of the "European paradox"," Economics Working Papers we1127, Universidad Carlos III, Departamento de Economía.
  6. Foster, James & Greer, Joel & Thorbecke, Erik, 1984. "A Class of Decomposable Poverty Measures," Econometrica, Econometric Society, vol. 52(3), pages 761-66, May.
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