Re: st: Marginal Effects for Logistic Mulitlevel Model withInteractionTerms

[Richard Williams <richardwilliams.ndu@gmail.com>]

At 04:50 AM 8/30/2010, Maarten buis wrote:
> --- On Mon, 30/8/10, Richard Williams wrote:
> > I notice that, unlike -mfx-, the new -margins- command does
> > not even  report marginal effects for interaction terms, e.g.
> ...
> > So, does this mean that marginal effects of interaction
> > terms are no longer an issue because Stata is now handling
> > them correctly, blending in the interaction effects with the
> > main effects? Or, would people still want to (somehow)
> > compute a marginal effect for the interaction term?
> ...
> Those are cases where you want to know the change in effect
> of one variable (education, parental social class) when
> another variable changes (gender, time). So in those cases
> you want some quantification of the size of the interaction
> effect.

I agree that we want some quantification of the size of interaction 
effects. But, is the marginal effect of the interaction term no 
longer even a candidate for that task, since margins does not report 
it? It seems that marginal effects of interaction terms have gone 
from being reported (incorrectly?) to not even being reported at 
all.  Which is fine with me, but it seems like there was a lot of 
concern in the past with getting the mfx of interaction terms 
reported "correctly" (e.g. there is the -inteff- program at SSC.)


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Richard Williams, Notre Dame Dept of Sociology
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