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st: -fracpoly-


From   "david huffer" <dhuffer@crim.umd.edu>
To   "Statalist" <statalist@hsphsun2.harvard.edu>
Subject   st: -fracpoly-
Date   Fri, 13 Dec 2002 05:57:44 -0500

I have little experience using -fracpoly- and I am seeking advice.  

I have a variable AGE and a variable CAGE which is the centered version
of AGE and I want to find out whether in a binary logistic reg model I
should model age as linear or noinlinear in the logit.  When I estimate
a fractional polynomial regression using AGE, the findings indicate I
should treat age as linear in the logit.  When I use CAGE, the findings
indicate I should use a one-term polynomial transformation and model
CAGE as nonlinear.

Should I use the uncentered version in -fracpoly- or the centered
version?

Thanks in advance.


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