[R-sig-Geo] identifying clusters between sets of points

[Sam Veloz]

I have 3 sets of points (A,B,C) with coordinates. I would like to test 
whether points from group A are more spatially clustered around points 
in group B or are points from group A more spatially clustered around 
points in group C. Can anyone suggest a test(or r function) for doing this?
Thanks,
Sam
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Sam Veloz
Postdoctoral Researcher
Department of Environmental Science and Policy
University of California, Davis
sdveloz at ucdavis.edu