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Re: st: marginal effects for ZINB with interactions and squared terms


From   "Austin Nichols" <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: marginal effects for ZINB with interactions and squared terms
Date   Fri, 3 Mar 2006 13:16:39 -0500

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 zero-inflated 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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