Citation impact environments of scientific journals

[Loet Leydesdorff]

Dear Steve,

I am afraid that I would then infringe the copyright restrictions of the ISI
because that would be their data. The data cannot be reconstructed from the
cosine matrices and I am now convinced that this should be the solution for
the visualization. I'll write that with a full argument in a brief
communication shortly.

Since I had this sorted out, I could put it in a do-while loop and thus
generate it for the full set (over night). Hopefully, people can make it
useful for their research applications. Of course, one can easily check the
original matrix if one has the values from the JCR available (either on-line
or as a CD-Rom).

With kind regards,


Loet

> -----Original Message-----
> From: ASIS&T Special Interest Group on Metrics
> [mailto:SIGMETRICS at LISTSERV.UTK.EDU] On Behalf Of Steven A. Morris
> Sent: Wednesday, January 05, 2005 3:20 PM
> To: SIGMETRICS at LISTSERV.UTK.EDU
> Subject: Re: [SIGMETRICS] Citation impact environments of
> scientific journals
>
> Loet,
>
> This is neat stuff.
>
> Are the original citing-cited matrices available anywhere?
>
> Thanks,
>
> Steve Morris
>
>
>
> On Wed, 5 Jan 2005 09:12:18 +0100, Loet Leydesdorff
> <loet at LEYDESDORFF.NET>
> wrote:
>
> >Citation environments for the 5907
> ><http://www.leydesdorff.net/jcr03/cited>
> >journals included in the Science Citation Index 2003 are now
> available
> >in the cited dimension at http://www.leydesdorff.net/jcr03/cited for
> >processing using Pajek.
> >
> >The journal names provide links to text-files which can be imported
> >into Pajek for the visualization of their respective citation
> >environments. Pajek can be retrieved at
> ><http://vlado.fmf.uni-lj.si/pub/networks/pajek/>
> >http://vlado.fmf.uni-lj.si/pub/networks/pajek/ . Its use is free for
> >academic purposes. The files below are also freeware for
> academic purposes.
> >Users may wish to provide a reference, for example, to my paper "
> ><http://www.leydesdorff.net/sosci01/art> Top-down
> Decomposition of the
> >Journal Citation Report of the Social Science Citation Index: Graph-
> >and factor-analytical approaches. Scientometrics 60 (2),
> 2004, 159-180.
> >
> >
> >
> ><http://users.fmg.uva.nl/lleydesdorff/jcr03/cited/index_files
> /image001.
> >jpg>
> >
> >
> >The citation environment of the journal Nanotechnology in
> 2003 (cited;
> >cosine ?  0.5).
> >
> >The citation environments are limited to those journals
> which cite the
> >seed journal more than one percent of its total citation
> rate or which
> >are being cited by this journal to more than one percent of
> its citation pattern.
> >(These two criteria operate independently.) These visualizations are
> >based on the cited-patterns of the journals. (See at
> ><http://www.leydesdorff.net/jcr03/citing>
> >http://www.leydesdorff.net/jcr03/citing for the
> corresponding files in
> >the citing dimension.)
> >
> >The cosine between the citation vectors is used insofar as
> it is ?  0.2.
> >Within Pajek one can increase this threshold (by using:
> Transform > Remove).
> >The representation of the citation patterns of Nanotechnology in the
> >figure, for example, is based on using a cosine ?  0.5.
> >
> >The files can be edited as ASCII text files. One can read them into
> >Pajek using the menu File > Network > Read, Choose the file name. By
> >partitioning the file (e.g., in terms of its core using Net >
> >Partition) one can colour the visualizations into different
> groupings
> >(File > Partition > Edit). Using the Options within the
> screen with the
> >visualization (Draw > Partition) one can vary the size of
> lines (e.g.,
> >3), the arrows (e.g., 0), and the fonts (e.g., 12).
> >
> >** apologies for cross-postings
> >  _____
> >
> >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 leydesdorff.net> loet at leydesdorff.net ;
> ><http://www.leydesdorff.net/> http://www.leydesdorff.net/
> >
> >
> > <http://www.upublish.com/books/leydesdorff-sci.htm> The
> Challenge of
> >Scientometrics ;
> <http://www.upublish.com/books/leydesdorff.htm> The
> >Self-Organization of the Knowledge-Based Society
> >
> >
>