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Observations concerning the two‐ and three‐year synchronous impact factor, based on the Chinese science citation database

Ronald Rousseau (KHBO Department of Industrial Sciences and Technology, Zeedijk 101, B‐8400 Oostende, Belgium and UIA, IBW, Universiteitsplein 1, B‐2610 Wilrijk, Belgium)
Bihui Jin (Xiaomin Liu Diccas, 8 Kexueyuan Nanlu, Zhongguancun, Beijing, 100080, PR China)
Ninghui Yang (Xiaomin Liu Diccas, 8 Kexueyuan Nanlu, Zhongguancun, Beijing, 100080, PR China)

Journal of Documentation

ISSN: 0022-0418

Article publication date: 1 June 2001

285

Abstract

Generally speaking, the three‐year synchronous impact factor is larger than the two‐year one. This follows from theoretical models derived from observations based on ISIÒs database. In this article we present an exception to this general rule, based on data from the Chinese Science Citation Database (CSCD). In 1998 42% of this databaseÒs source journals did not follow the expected trend. As a possible explanation we note that, contrary to intuition, in the CSCD the changes in the number of both publications and citations are largely independent. It is, however, not ruled out that the observed discrepancies are nothing but statistical fluctuations of the basic publication‐citation model.

Keywords

Citation

Rousseau, R., Jin, B. and Yang, N. (2001), "Observations concerning the two‐ and three‐year synchronous impact factor, based on the Chinese science citation database", Journal of Documentation, Vol. 57 No. 3, pp. 349-357. https://doi.org/10.1108/EUM0000000007086

Publisher

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MCB UP Ltd

Copyright © 2001, MCB UP Limited

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