[R] two-dimensional Kolmogorov-Smirnow (2DKS) test

[David Winsemius]

On Oct 9, 2011, at 1:46 PM, Beaulieu.Jake at epamail.epa.gov wrote:

> 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!
>

I have not been able to find an R implementation. (Tried RSiteSearch  
and RSeek with "2d kolmogorov" and pursued promising links and  
citations.  This 2005 article suggests that it is not a simple (or  
even a well-defined) problem:

http://bura.brunel.ac.uk/bitstream/2438/1166/1/acat2007.pdf

This effort at a parallelized solution reports little improvement,  
perhaps supporting the Lopes, el al conclusion that the Cooks  
algorithm is not O(n*log(n) after all.

And this is a page with a link to some Matlab code:

http://www.subcortex.net/research/code/testing-for-differences-in-multidimensional-distributions


> 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.
>
-- 

David Winsemius, MD
West Hartford, CT