Hi R helpers, Is there a function (package?) in R available which tests "spatial autocorrelation" between points (e.g. vector layer of weather stations)? (e.g. Moran's I...) Via the archives we found out that there is a package 'spdep' which uses grid data for testing spatial autocorrelation. Thanks a lot, Jan _______________________________________________________________________ Jan Verbesselt Research Associate Lab of Geomatics and Forest Engineering K.U. Leuven Vital Decosterstraat 102. B-3000 Leuven Belgium Tel:+32-16-329750 Fax: +32-16-329760 http://gloveg.kuleuven.ac.be/
On Mon, 26 Apr 2004, Jan Verbesselt wrote:> Hi R helpers, > > Is there a function (package?) in R available which tests "spatial > autocorrelation" between points (e.g. vector layer of weather stations)? > (e.g. Moran's I...) > > Via the archives we found out that there is a package 'spdep' which uses > grid data for testing spatial autocorrelation. >I think you will find that spdep contains the tools you need to build neighbour lists from points (for example by triangulation, tri2nb()), in order to calculate Moran's I. Look at the help pages for knearneigh(), tri2nb(), dnearneigh(), and/or graph2nb() to get an idea of the possibilities. Other functions can be used to modify triangulation neighbours, bu note that if you generate points with no neighbours for your definition of neighbours, you will need to specify this in arguments to analysis functions. Roger Bivand> Thanks a lot, > Jan > > > _______________________________________________________________________ > Jan Verbesselt > Research Associate > Lab of Geomatics and Forest Engineering K.U. Leuven > Vital Decosterstraat 102. B-3000 Leuven Belgium > Tel:+32-16-329750 Fax: +32-16-329760 > http://gloveg.kuleuven.ac.be/ > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >-- 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 at nhh.no
Dear Jan There is an excelent spatial library wich includes Moran's I and other tests, developed by Richard Davis and Robin Reich from Colorado State University but I am not sure that it is currently available in the R site since it is still on development. You may want to email them to see if you can have access to their library. You can search for their contact information at http://search.colostate.edu/index.asp?page=home&module=directory I hope that this helps Francisco>From: "Jan Verbesselt" <Jan.Verbesselt at agr.kuleuven.ac.be> >To: <r-help at stat.math.ethz.ch> >Subject: [R] Spatial Autocorrelation for point data >Date: Mon, 26 Apr 2004 10:43:57 +0200 > >Hi R helpers, > >Is there a function (package?) in R available which tests "spatial >autocorrelation" between points (e.g. vector layer of weather stations)? >(e.g. Moran's I...) > >Via the archives we found out that there is a package 'spdep' which uses >grid data for testing spatial autocorrelation. > >Thanks a lot, >Jan > > >_______________________________________________________________________ >Jan Verbesselt >Research Associate >Lab of Geomatics and Forest Engineering K.U. Leuven >Vital Decosterstraat 102. B-3000 Leuven Belgium >Tel:+32-16-329750 Fax: +32-16-329760 >http://gloveg.kuleuven.ac.be/ > >______________________________________________ >R-help at stat.math.ethz.ch mailing list >https://www.stat.math.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide! >http://www.R-project.org/posting-guide.html
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