Dear list-members,
I would like to estimate a logit model with sample
selection but since there's only -heckprob- available in
Stata, I was wondering whether it would be incorrect to do
the following instead:
1. Estimate the selection equation using -logit-.
2. Calculate the inverse Mills' ratio (IMR).
3. Use the IMR from above as a regressor in a second-stage
logit model.
If this is a correct approach, my next question is:
How can one calculate the IMR after a logit model? (I have
checked the Stata listserver archives but didn't find
anything related.)
Any help regarding the above would be much appreciated.
Thank you.
Nishant
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