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Re: st: RE: Re: Re: Re: Fracpoly

From   Maarten buis <>
Subject   Re: st: RE: Re: Re: Re: Fracpoly
Date   Tue, 12 Feb 2008 08:00:01 +0000 (GMT)

--- Nick Cox <> 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:

Hope this helps,

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

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