Another error in Impact Factors?

Loet Leydesdorff loet at LEYDESDORFF.NET
Mon Mar 6 06:33:17 EST 2006

Dear Juan,

The IF = 0.006 points to a 1 citation. 1/173 = 0.00578. Single citations are
lumped together under "all others" by the ISI? However, I did not know that
this was done also for the individual years.

Best,   Loet

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


From: ASIS&T Special Interest Group on Metrics
[mailto:SIGMETRICS at LISTSERV.UTK.EDU] On Behalf Of Juan Miguel Campanario
Sent: Monday, March 06, 2006 11:52 AM
Subject: [SIGMETRICS] Another error in Impact Factors?


Here is another problem with the calculation
of IF.
I just copied from the ISI Web of Science (JCR)



Journal Impact Factor 97c37d.jpg

Cites in 2004 to articles published in: 2003 = 0    Number of articles
published in: 2003 = 88
                                                      2002 = 0
2002 = 85
                                                         Sum: 0
Sum: 173
Calculation: Cites to recent articles  0 = 0.006
  Number of recent articles  173

Maybe I am using the wrong numbers, but I just copied from the JCR.
What happens here?

Juan Miguel Campanario

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 97c37d.jpg
Type: image/jpeg
Size: 980 bytes
Desc: not available
URL: <>

More information about the SIGMETRICS mailing list