Power laws in citation distributions: Evidence from Scopus
Modeling distributions of citations to scientific papers is crucial for understanding how science develops. However, there is a considerable empirical controversy on which statistical model fits the citation distributions best. This paper is concerned with rigorous empirical detection of power-law behaviour in the distribution of citations received by the most highly cited scientific papers. We have used a large, novel data set on citations to scientific papers published between 1998 and 2002 drawn from Scopus. The power-law model is compared with a number of alternative models using a likelihood ratio test. We have found that the power-law hypothesis is rejected for around half of the Scopus fields of science. For these fields of science, the Yule, power-law with exponential cut-off and log-normal distributions seem to fit the data better than the pure power-law model. On the other hand, when the power-law hypothesis is not rejected, it is usually empirically indistinguishable from most of the alternative models.
|Date of creation:||2014|
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- Ruiz-Castillo, Javier & Ortuño, Ignacio & Crespo, Juan A. & Albarrán, Pedro, 2011. "The skewness of science in 219 sub-fields and a number of aggregates," UC3M Working papers. Economics we1109, Universidad Carlos III de Madrid. Departamento de Economía.
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