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st: RE: xi3: mlogit effect coding


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: xi3: mlogit effect coding
Date   Thu, 1 Feb 2007 10:44:48 +0100

--- Diego Bassani wrote:
> When I estimate two way interactions using xi3 and a mlogit model,
> the  rrr option is:
>
> a) an Odds Ratio
> b) a Prevalence rate Difference
> c) a Risk-Density
> 
> Since the betas are the deviance from the 'grand mean' of betas I am
> inclined to interpret it as a prevalence rate difference. I am
> seriously doubting myself on this one... any help?

A while ago Bobby Gutierrez wrote an extensive post on Statalist 
on the issue of odds ratios or relative risk ratios in 
multinomial logistic regression:
http://www.stata.com/statalist/archive/2005-04/msg00678.html

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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