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Spatial Autocorrelation for point data

2 messages · Jan Verbesselt, Roger Bivand

Original
Jan Verbesselt
# 
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/
Roger Bivand
#
On Mon, 26 Apr 2004, Jan Verbesselt wrote:

            

      
      
      
    

        
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