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st: any help?


From   "is300gp" <is300gp@u.washington.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: any help?
Date   Tue, 20 Apr 2004 12:51:23 -0700

Dear all:

I have a question about the Heckman 2-stage estimation:
consider the model:

Y=X*b+e1
I=Z*gamma+e2   and    I*=1 if I>0

Usually, the Heckman command gives the regression coefficients b when I>=0
or I*=1;
1. is there a command for estimating Y at the mean value of the independent
varibales? like the mfx command default at mean value?
2. What should I do if I want to get the the coefficients b when I<0 or
I*=0? Is there a command for this?

Thanks a lot.


Gang

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