The reference below describes the utility of the two-dimensional 
Kolmogorov-Smirnow (2DKS) test for detecting relationships in bivariate 
data.  If this test has been implemented in R I would love to know about 
it!

Thanks,
jake


Garvey, J. E., E.A. Marschall, and R.A. Wright (1998). "From star charts 
to stoneflies: detecting relationships in continuous bivariate data." 
Ecology 79(2): 442-447.

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