On Oct 9, 2011, at 1:46 PM, beaulieu.j...@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
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