[R-sig-Geo] Join count analysis in R

[geetha ramaswami]

Thanks!

On Wed, May 25, 2011 at 12:40 PM, Roger Bivand <Roger.Bivand at nhh.no> wrote:
> On Wed, 25 May 2011, geetha ramaswami wrote:
>
>> Hi,
>>
>> I am trying to do some join count statistical analysis on my data (a
>> grid of 5000 cells with values 1 or 0) in order to determine whether
>> there is spatial clustering of pixels. Is there a built-in function
>> available in any of the spatial stats packages of R (I cannot seem to
>> locate it, if it is present)?
>
> See joincoint.test() in spdep for the original Cliff/Ord test. You'll need
> to construct a weights object, probably using dnearneigh() and nb2listw() in
> the same package, and ensure that the input data are in vector form in the
> same order as the weights. See also the examples for joincoint.test() and
> joincoint.multi().
>
> Roger
>
>>
>> Geetha
>>
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>
> --
> Roger Bivand
> Economic Geography Section, Department of Economics, Norwegian School of
> Economics and Business Administration, Helleveien 30, N-5045 Bergen,
> Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
> e-mail: Roger.Bivand at nhh.no
>
>