I second that - quantile regression seems to be what you want.
on 07/23/2008 10:10 AM Ben Bolker said the following:
Firas Swidan <frsswdn <at> gmail.com> writes:
Hi,
I am having difficulties in finding ways to analyse scatter plots and
quantitatively differentiate between them.
Try quantile regression, implemented in Roger Koenker's quantreg
package. There's a very thorough vignette (library(quantreg); vignette("rq")).
Ben Bolker
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