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st: RE: heckprob questions

From   "Nick Cox" <>
To   <>
Subject   st: RE: heckprob questions
Date   Wed, 12 Nov 2003 22:19:17 -0000

I don't have specific answers to this question, 
but there is some generic handwaving on R-sq at

After that was posted, there was a Statalist thread on R-square
with many extra pieces of advice. (Some were: Don't 
take R-sq too seriously.) 


Jun Xu
> Again, related to the heckprob (Heckman probit selection) command,
> 3. Again, how to get a scalar measure of the heckprob model 
> (like R-square). 
> I posted this question days ago. The real problem is that, 
> for example, if I 
> want to use McFadden's R2, what's the null model (the null 
> model with two 
> intercepts only for both the main and selection equations 
> will not be 
> estimated, or shoudl I use the null model when the 
> selection process is 
> fully specified, while only have an intercept for the main 
> model?). 
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