Impact Factor and Immediacy Index

Loet Leydesdorff loet at LEYDESDORFF.NET
Wed Mar 15 01:34:01 EST 2006

Dear colleagues,

In reaction to my posting last week with the figures in which the Impact
Factor, the c/p ratio, and the Immediacy Index were grouped together as a
single component, someone noted a previous publication by

Weiping Yue, Concepsion S. Wilson, and Ronald Rousseau, "The Immediacy Index
and the Journal Impact Factor: Two Highly Correlated Derived Measures," The
Canadian Journal of Information and Library Science, 28(1) (2004) 33-48.

The authors argue that the II can be used as a predictor for the IF in the
next year because they are correlated.

With best wishes,



Loet Leydesdorff
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam
Tel.: +31-20- 525 6598; fax: +31-20- 525 3681
 <mailto:loet at> loet at ;

 <> The Knowledge-Based Economy: Modeled,
Measured, and Simulated
The Self-Organization of the Knowledge-Based Society;
The Challenge of Scientometrics

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