Journal maps for 2007 now available

[Loet Leydesdorff]

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 http://www.leydesdorff.net/jcr07/cited for the local citation
impact environments of journals and at
http://www.leydesdorff.net/jcr07/citing 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
http://vlado.fmf.uni-lj.si/pub/networks/pajek/. )
 
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  <http://www.leydesdorff.net/jcr04/index.htm> "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.
<http://www.leydesdorff.net/jcr04/jcr2pajek.pdf> <pdf version> 
 
Best wishes, 
 
 
Loet
 
** apologies for cross-postings
 
  _____  

Loet Leydesdorff 
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam
 <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
<http://www.leydesdorff.net/> http://www.leydesdorff.net/ 


Visiting Professor 2007-2010,  <http://www.istic.ac.cn/Eng/brief_en.html>
ISTIC, Beijing; Honorary Fellow 2007-2010,  <http://www.sussex.ac.uk/spru/>
SPRU, University of Sussex 
Now available:
<http://www.universal-publishers.com/book.php?method=ISBN&book=1581129378>
The Knowledge-Based Economy: Modeled, Measured, Simulated, 385 pp.; US$
18.95;
 <http://www.universal-publishers.com/book.php?method=ISBN&book=1581126956>
The Self-Organization of the Knowledge-Based Society ;
<http://www.universal-publishers.com/book.php?method=ISBN&book=1581126816>
The Challenge of Scientometrics

 
 
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