Document (#36188)

Author

Campanario, J.M.

Title

Large increases and decreases in journal impact factors in only one year : the effect of journal self-citations

Source

Journal of the American Society for Information Science and Technology. 62(2011) no.2, S.230-235

Year

2011

Abstract

I studied the factors (citations, self-citations, and number of articles) that influenced large changes in only 1 year in the impact factors (IFs) of journals. A set of 360 instances of journals with large increases or decreases in their IFs from a given year to the following was selected from journals in the Journal Citation Reports from 1998 to 2007 (40 journals each year). The main factor influencing large changes was the change in the number of citations. About 54% of the increases and 42% of the decreases in the journal IFs were associated with changes in the journal self-citations.

Theme

Informetrie

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4. Raan, A.F.J. van: Self-citation as an impact-reinforcing mechanism in the science system (2008) 0.40

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5. Campanario, J.M.: Self-citations that contribute to the journal impact factor : an investment-benefit-yield analysis (2010) 0.39

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