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Research Article
Article impact calculated over arbitrary periods
Article first published online: 26 OCT 2004
DOI: 10.1002/asi.20100
Copyright © 2004 Wiley Periodicals, Inc.
Issue
Journal of the American Society for Information Science and Technology
Volume 56, Issue 1, pages 58–62, 1 January 2005
Additional Information
How to Cite
Frandsen, T. F. and Rousseau, R. (2005), Article impact calculated over arbitrary periods. Journal of the American Society for Information Science and Technology, 56: 58–62. doi: 10.1002/asi.20100
Publication History
- Issue published online: 3 DEC 2004
- Article first published online: 26 OCT 2004
- Manuscript Revised: 30 JAN 2004
- Manuscript Accepted: 30 JAN 2004
- Manuscript Received: 16 SEP 2003
- Abstract
- Article
- References
- Cited By
Abstract
In this paper we address the various formulations of impact of articles, usually groups of articles as gauged by citations that these articles receive over a certain period of time. The journal impact factor, as published by ISI (Philadelphia, PA), is the best-known example of a formulation of impact of journals (considered as a set of articles) but many others have been defined in the literature. Impact factors have varying publication and citation periods and the chosen length of these periods enables, e.g., a distinction between synchronous and diachronous impact factors. It is shown how an impact factor for the general case can be defined. Two alternatives for a general impact factor are proposed, depending on whether different publication years are seen as a whole, and hence treating each one of them differently, or by operating with citation periods of identical length but allowing each publication period different starting points.