Citation impact environments of scientific journals

Steven A. Morris samorri at OKSTATE.EDU
Wed Jan 5 09:19:51 EST 2005


This is neat stuff.

Are the original citing-cited matrices available anywhere?


Steve Morris

On Wed, 5 Jan 2005 09:12:18 +0100, Loet Leydesdorff <loet at LEYDESDORFF.NET>

>Citation environments for the 5907  <>
>journals included in the Science Citation Index 2003 are now available in
>the cited dimension at 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  <>
> . 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 "
><> 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.
>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
> 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> loet at ;
> <> The Challenge of
>Scientometrics ;  <> The
>Self-Organization of the Knowledge-Based Society

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