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st: ycond and pcond help


From   Wendy Edelberg <wedelber@harper.uchicago.edu>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: ycond and pcond help
Date   Mon, 28 Oct 2002 09:11:40 -0600

I already tried asking this list the following question, and tragically 
heard nothing. I am bothering everyone one more time before I give up:

Does anyone know what mathematically is going on with ycond and pcond when 
using predict after Heckman and Heckprob, respectively. First, I am hoping 
I can interpret these predictions as predicted values and probabilities 
conditional on selection -- wages conditional on having a job or 
probability of illness conditional on treatment, say. Second, I need to 
recreate these given the parameters, and I can't seem to unwind what the 
commands are doing. Any suggestions?
Wendy


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