take a look at predict.smooth.Pspline in the package pspline...
url: www.econ.uiuc.edu/~roger Roger Koenker email [EMAIL PROTECTED] Department of Economics vox: 217-333-4558 University of Illinois fax: 217-244-6678 Champaign, IL 61820
On Jul 1, 2004, at 10:49 AM, Martin aus Chemnitz wrote:
Hi!
Some weeks ago I discovered R. Now, I have a somewhat complicated task and am not sure whether R is the right tool to solve it.
I got data of several series or measurements where I have to find the two inflection points. I did a linear regression (with ^2 and ^3 arguments), the problem there was that I had to look only at a very narrow band of measurement in order to get the approximation right at the essential point. (Maybe there is a better way than lm?)
Now that I have an appromiated function, I need its inflection point, but I could not find any R function for that. Is there any? Or can anyone recommend a good (possibly free) mathematical programme?
Maybe this could be helpful: All the measurements look like this and I marked the points of interest.
,------- / / <-- / ,----� / | <-- / -----�
Thank you very much for your help
Martin
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