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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 "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/index.htm>
<http://www.leydesdorff.net/jcr04/jcr2pajek.pdf>  
 
Best wishes, 
 
 
Loet
 
** apologies for cross-postings
 
________________________________

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

[log in to unmask] <http://www.leydesdorff.net/>  

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