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RE: st: RE: transformation of a continuous variable for a logistic regression model


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: transformation of a continuous variable for a logistic regression model
Date   Thu, 20 Apr 2006 12:30:46 +0100

I don't have any advice except the standard: 
Study the original papers by Royston, Altman 
and Sauerbrei on fractional polynomials really 
carefully. It is evident
from the paper you cited earlier that the main
ideas can get garbled in n th-hand accounts. 

It might be useful to plot the predictors 
produced by -fracgen- against each other to
keep an eye on their interdependence. 

Nick 
n.j.cox@durham.ac.uk 

Suzy
  
> If you have any recommendations for further reading that 
> discusses the underlying issue at hand, please let me know.
> 

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