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GEOSTATS: Ripley's K functions

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  • Martin Béland
    Hi, 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
    Message 1 of 3 , Mar 21, 2000
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      Hi,

      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.

      I know that "ads in ade-4" available at
      http://pbil.univ.lyon1.fr/ADE-4/ADE-4.html can compute the univariate
      statistic but the software does not include the bivariate statistic yet.
      The authors told me I could get the C routines upon request. I am not
      familiar with C language and would prefer using a user-friendly
      software.

      Any help would be appreciated.

      Martin Béland
      Université du Québec en Abitibi-Témisamingue
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    • Roger Bivand
      ... One possibility is Splancs (Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19,
      Message 2 of 3 , Mar 21, 2000
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        On Tue, 21 Mar 2000, Martin Béland wrote:

        > Hi,
        >
        > 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:

        http://www.maths.lancs.ac.uk/~rowlings/Splancs/

        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) for
        Splancs:

        ftp://reclus.nhh.no/pub/R/splancs-2.01-1.tar.gz

        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
        R.

        Hope this helps,

        Roger

        --
        Roger Bivand
        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
        e-mail: Roger.Bivand@...
        and: Department of Geography and Regional Development, University of
        Gdansk, al. Mar. J. Pilsudskiego 46, PL-81 378 Gdynia, Poland.

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      • Justin_Quirouette@pch.gc.ca
        Hello Martin, Have you considered the CrimeStat application available @ http://www.icpsr.umich.edu/NACJD/crimestat.html Hope this helps, Justin Justin
        Message 3 of 3 , Mar 21, 2000
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          Hello Martin,

          Have you considered the CrimeStat application available @
          http://www.icpsr.umich.edu/NACJD/crimestat.html

          Hope this helps,
          Justin


          Justin Quirouette
          Regional GIS Specialist
          Parks Canada Agency - Ontario Service Centre








          Martin Bland <Martin.Beland@...> on 03/21/2000 10:17:51 AM

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          Subject: GEOSTATS: Ripley's K functions
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