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Re: st: Interpretation of interaction term in nonlinear models


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Interpretation of interaction term in nonlinear models
Date   Thu, 30 May 2013 13:29:06 +0200

Here is an example:
<http://www.stata.com/statalist/archive/2011-10/msg00938.html>

Hope this helps,
Maarten

On Thu, May 30, 2013 at 1:19 PM, Suryadipta Roy wrote:
> I am studying the effect of an interaction between a categorical
> variable (0/1) and a continuous variable (0-6) on the dependent
> variable in a nonlinear model (using -xtpoisson-). The value of the
> coefficient using the -irr- option is 0.90, while the size of the
> interaction term in the probability metric form is, of course, -0.11
> (exp(-0.11) = 0.90). My basic question is, if it might be possible to
> have a one-sentence interpretation of the value of the coefficient in
> the multiplicative form (0.90), e.g. something in the lines of "the
> effect of the categorical variable increases by a factor of 0.9 (i.e.
> a 10% reduction of the dependent variable) due to an 1% increase in
> the continuous variable"? Any suggestion in this regard will be highly
> appreciated.
>
> Sincerely,
> Suryadipta Roy.
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--
---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
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