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Re: st: Poisson model with interaction term


From   agostino@unical.it
To   statalist@hsphsun2.harvard.edu, Maarten buis <maartenbuis@yahoo.co.uk>
Subject   Re: st: Poisson model with interaction term
Date   Mon, 25 Feb 2008 16:48:28 +0100

thank you Maarten, hence I can simply apply the linear case formulas...

thanks again
Maria
Citazione Maarten buis <maartenbuis@yahoo.co.uk>:

> --- agostino@unical.it wrote:
> > I’m estimating a Poisson model, which includes an interaction term 
> > and I need to compute the impact (marginal effect) of x1 on lnY.
> >
> > I have found on SJ an article “Computing interaction effects and
> > standard errors in Logit and Probit models”, by Norton, Wang and Ai
> > (2004), who warn that for nonlinear models 
> <snip>
> >  Please notice that my interest is  computing the effect of x1 on lnY
> > ,  I’m not interested in the marginal effect of the interaction term,
> > nor in the effect of  x1 on E(Y), because my dependent variable is
> > not a count.
> <snip>
> 
> If you are only interested in the effect on ln(y) than it is no longer
> a non-linear model, so the article by Norton et al. is no longer
> relevant. 
>  
> -- 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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