On Jun 30, 2010, at 2:05 PM, Asha Sharma wrote:
Hi,
I am looking for a way to find the lower envelope of points on a
plot, preferably specifying what percentage of points should be
allowed to lie outside the envelope. There must be a straightforward
way to do this, but I do not seem to be able to find it. I would
greatly appreciate any help.
You probably want something like the "lower half" of the convex hull.
You should find quite a bit of code with your favorite r search engine
on the topic of "convex hull".
--
David Winsemius, MD
West Hartford, CT
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