
From  "Rullani Francesco" <rullani@sssup.it> 
To  statalist@hsphsun2.harvard.edu 
Subject  Re: Re: st: marginal effects for ZINB with interactions andsquared terms 
Date  Mon, 06 Mar 2006 12:19:36 +0100 
Austin,interactions and squared terms Have you read http://www.stata.com/support/faqs/stat/mfx_dydx.html http://www.stata.com/support/faqs/stat/mfx_interact.html yet? A good place to start.
On 3/3/06, Rullani Francesco <rullani@sssup.it> wrote:I am estimating a model with interactions:
a+b(x_1)+c(x_2)+d(x_1*x_2)
and squared terms:
e+f(z_1)+g(z_1)^2
using a zeroinflated negative binomial regression (ZINB)
because of overdispersion and excess of zeros in the data.
Does anyone know how I can obtain marginal effects and
their standard errors, given that mfx and margeff do not
"know" that I have interactions and squared terms?
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