How are new citation-based journal indicators adding to the bibliometric toolbox?; preprint version available

Loet Leydesdorff loet at LEYDESDORFF.NET
Fri Oct 31 06:40:46 EDT 2008

How are new  <>
citation-based journal indicators 

adding to the  <>
bibliometric toolbox?




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
them? 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. 


Keywords: impact, H-index, journal, citation, centrality, ranking



Loet Leydesdorff 
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam.
Tel. +31-20-525 6598; fax: +31-842239111
 <mailto:loet at> loet at ;

Visiting Professor 2007-2010,  <>
ISTIC, Beijing; Honorary Fellow 2007-2010,  <>
SPRU, University of Sussex 
Now available:
The Knowledge-Based Economy: Modeled, Measured, Simulated, 385 pp.; US$
The Self-Organization of the Knowledge-Based Society ;
The Challenge of Scientometrics

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