On Tue, 21 Mar 2000, Martin Béland wrote:
> I am looking for a software to compute ripley's K univariate statistics
> for determining if a pattern of point representing the location of trees
> in a forest is random, uniform or aggregated. I also need to compute
> ripley's bivariate statistic to determine if two groups of point (tree
> species) are attracted or repulsed.
One possibility is Splancs (Rowlingson, B. and Diggle, P. 1993 Splancs:
spatial point pattern analysis code in S-Plus. Computers and Geosciences,
19, 627-655.) at:
This is a library of functions for S-Plus, including both the ones you
need. I have made a port for R (see http://cran.r-project.org)
The "spatial" library by Venables and Ripley (the same Ripley), including
the single pattern K measure, is part of the VR bundle for both S-Plus and
Hope this helps,
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
and: Department of Geography and Regional Development, University of
Gdansk, al. Mar. J. Pilsudskiego 46, PL-81 378 Gdynia, Poland.
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