Re: st: Marginal Effects for Logistic Mulitlevel Model withInteractionTerms

[Iris.C.Goensch@zeu.uni-giessen.de]

Thanks a lot for all your help!
Unfortunately I'm still not sure what to do:

-mfx does not recognize interaction terms and thus does not calculate  
the marginal effects for interaction terms in the correct way (the  
problems resulting are explained in Ai/ Norton and Greene (2010).

-Does it make sense not to calculate any marginal effects but just to  
include interaction terms in the multilevel logit model and estimate  
that with the stmelogit command and the odds ratio (or) option? Or do  
I have the same conceptual problem that I can't interpret odds ratios  
for interaction terms?

Best,
Iris

Zitat von Maarten buis <maartenbuis@yahoo.co.uk>:

> --- On Thu, 19/8/10, Iris.C.Goensch@zeu.uni-giessen.de wrote:
> > I am estimating a logistic multilevel model (which
> > includes interaction terms) and I would like to calculate marginal
> > effects, but I always get the error "default prediction is a
> > function of possibly stochastic quantities other than e(b)".
>
> The marginal effect depends on all covariates including the random
> effects. The random effects is the stochastic quantity that the
> error message complaints about. I think that the easiest solution
> is to report odds ratios. This has the added advantage that it
> also makes the interpretation of the interaction effects much
> easier.
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>
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--

Iris Gönsch
Research Assistant
Centre for International Development and Environmental Research (ZEU)
University of Giessen
Senckenbergstr. 3
D-35390 Giessen, Germany


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