--- Nick Cox <[email protected]> wrote:
> Nevertheless you want to extract properties that depend on first and
> second derivatives. That seems to me to invest a great deal of trust
> in the models, which are not necessarily optimal for that purpose.
> However, I don't have a good alternative solution, but I would
> recommend some comparison with quite different ways of doing it, e.g.
> based on numerical differentiation of other kinds of smooth fit.
I have done something similar using a loess, but I switched to R to do
so. The working paper is here:
http://home.fsw.vu.nl/m.buis/wp/locfit.html
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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