In addition to the taskview (below), you might consider using the "sos"
package, something like the following:
sa <- ???'spatial autocorrelation' # 58 matches
sc <- ???'spatial correlation' # 181 matches
s. <- sa|sc # union of the to 'findFn' objects
summary(s.) # 224 links in 57 packages
installPackages(s.) # install packages with at least 5 >=
sqrt(max(count)) matches
writeFindFn2xls(s.) # write an Excel file with 3 sheets: PackageSum2,
findFn, call
This tells you that 22 help pages in "spdep" matched the search
term, plus 18 pages in each of nlme, ncf, and spatstat, as well as 17 in
ramps and 15 in geoR. The "PackageSum2" sheet also provides other
information to help you decide which package to consider first.
Beyond this, you may like to uses these functions with other
search terms; see vignette('sos') for more information.
Hope this helps.
Spencer
Disclaimer: I'm the lead author of "sos".
Corey Sparks wrote:
Hi Paulo,
if your data are distance matrices, you might consider doing a Mantel test,
look at the mantel() function in package vegan. While this is not
technically measuring spatial autocorrelation, it will test for correlation
between the attribute distances and the geographic distances. Also, if you
can coax your data back into a point shapefile (for example), you can use
the tools in the spdep package which will measure actual spatial
autocorrelation (such as Moran's I and Geary's C).
Best,
Corey
silcha wrote:
Hi Paulo,
you may want to take a look at
http://cran.r-project.org/web/views/Spatial.html
there, you can find all "spatial" packages that
can be useful for your question.
There is also a a mailing list R-sig-geo that where
you can ask all those kind of question.
Hope that this helps.
Cheers
Anna
Anna Freni Sterrantino
Ph.D Student
Department of Statistics
University of Bologna, Italy
via Belle Arti 41, 40124 BO.
________________________________
Da: P.Branco <pjlbra...@yahoo.com>
A: r-help@r-project.org
Inviato: Martedì 6 ottobre 2009, 13:28:36
Oggetto: [R] Spatial Autocorrelation
Hello,
I have a matrix with the distances among sites. And I have another matrix
with the presence and absence of each species in each site. I would like
to
test the spatial autocorrelation among sites.
I have tried to use the function gearymoran of the ade4 package, but error
messages keep popping up. Do you know any function for me to test the
spatial autocorrelation of my data?
Thanks,
Paulo Branco
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