How are new citation-based journal indicators adding to the bibliometric toolbox?
Article first published online: 2 FEB 2009
© 2009 ASIS&T
Journal of the American Society for Information Science and Technology
Volume 60, Issue 7, pages 1327–1336, July 2009
How to Cite
Leydesdorff, L. (2009), How are new citation-based journal indicators adding to the bibliometric toolbox?. J. Am. Soc. Inf. Sci., 60: 1327–1336. doi: 10.1002/asi.21024
- Issue published online: 5 JUN 2009
- Article first published online: 2 FEB 2009
- Manuscript Accepted: 4 DEC 2008
- Manuscript Revised: 2 DEC 2008
- Manuscript Received: 31 OCT 2008
The launching of Scopus and Google Scholar, and methodological developments in social-network analysis have made many more indicators for evaluating journals available than the traditional impact factor, cited half-life, and immediacy index of the ISI. In this study, these new indicators are compared with one another and with the older ones. Do the various indicators measure new dimensions of the citation networks, or are they highly correlated among themselves? Are they robust and relatively stable over time? Two main dimensions are distinguished—size and impact—which together shape influence. The h-index combines the two dimensions and can also be considered as an indicator of reach (like Indegree). PageRank is mainly an indicator of size, but has important interactions with centrality measures. The Scimago Journal Ranking (SJR) indicator provides an alternative to the journal impact factor, but the computation is less easy.