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Re: st: piece-wise logistic regression


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: piece-wise logistic regression
Date   Thu, 29 Apr 2010 15:13:50 +0000 (GMT)

--- On Thu, 29/4/10, Steve Samuels wrote:
> The location of the threshold is an important parameter in the 
> literature of this model.  I recall using non-linear regression
> in NCSS  to find a CI for the location. 

Yes that is definately possible within a linear regression
context, the -nl- routine is however very senstitive to
good starting values:
http://www.stata.com/statalist/archive/2008-01/msg01006.html

Problem is, that the original question was about the 
applicability of splines in logistic regression, and 
this strategy won't work there:
http://www.stata.com/statalist/archive/2010-01/msg01038.html

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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