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st: Calculating Marginal Effects for Heckman Probit Model


From   J.Jochim@warwick.ac.uk
To   statalist@hsphsun2.harvard.edu
Subject   st: Calculating Marginal Effects for Heckman Probit Model
Date   Tue, 19 Aug 2008 09:54:55 +0100 (BST)

Hello,

I am estimating a Heckman Probit model with Selection and some of my
variables appear in both the outcome and the selection equation.
My question is: How can I interpret these variables?
As far as I understand it the coefficients (and marginal effects produced
by Stata) give no indication about the true marginal effect if the
variable appears in both equations, but so far I have not found a way to
get the actual marginal effects.

Any help would be greatly appreciated!

Jo
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