Dear Stata Users,
I am applying the two step Heckmam model, but I am having a problem.
After having completed the Heckman model.
As further check I have tried to perform the probit model (decision equation of Heckman procedure).
However, even though I use exactly the same variables, the coefficients of some independent v. and pvalues are completely different from those obtained with Heckman.
I have already Heckman in past, but It is the first time i meet this problem.
If someone can help, I will strongly appreciate
thanks in advance
Nicola
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