Journal maps for 2007 now available

Loet Leydesdorff loet at LEYDESDORFF.NET
Fri Sep 5 04:24:05 EDT 2008

Dear colleagues, 
Input files for generating journal maps for the journals contained in the
Science Citation Index and the Social Science Citation Index 2007 are now
available at for the local citation
impact environments of journals and at for the citation activity
environment of each journal. The files are in the so-called Pajek format.
(The visualization program Pajek is freely available at )
The files are based on including all journals which contribute to the total
citations (cited and citing, respectively) to the extent of more than 1%
(after substraction of the journal "self"-citations). In order to enhance
visualization effects (using, for example, Kamada-Kawai in Pajek) cosine
values are provided for cosine > 0.2. For those of you who read this message
under html, the following example is provided for the local citation impact
environment of Scientometrics:

The lines indicate strenght of the similarity in being-cited patterns in
this local citation environment of Scientometrics. 
These files can also be used as lists of journals which provide a reference
for comparing among journals in relevant citation environments in terms of
impact factors, etc. See for more details about the methodology, my paper
entitled  <> "Visualization of the
Citation Impact Environment of Scientific Journals: An online mapping
exercise," Journal of the Amererican Society for Information Science and
Technology 58(1), 25-38, 2007.
<> <pdf version> 
Best wishes, 
** apologies for cross-postings

Loet Leydesdorff 
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam
 <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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: attcc309.jpg
Type: image/jpeg
Size: 28094 bytes
Desc: not available
URL: <>

More information about the SIGMETRICS mailing list