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Re: st: Odds ratio for interaction term


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Odds ratio for interaction term
Date   Tue, 10 Jun 2008 15:35:04 +0100 (BST)

--- Ricardo Ovaldia <ovaldia@yahoo.com> wrote:
> Is there a way to compute a single OR for the interaction between
> two dummies (one at three leves), and between a dummy and a
> continuos variable. -xi:logistic- produces an OR for each combination
> of the -xi- interactions.

You can't without imposing constraints, so you'll have to decide what
kind of constraint makes sense to you. One type of constraint that
could make sense is a proportionality constraint:
http://home.fsw.vu.nl/m.buis/presentations/propcnsreg.pdf

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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