Hi
I have a strange problem.
When I try to run a model using heckman my model is not concave, however when I make the heckman model in manual mode (probit and then reg including the IMR, following https://www.stata.com/statalist/arch.../msg00728.html ) I have no problems.
In addition, in the probit model, iterations concludes when it reach the same log likelihood in which the Heckman model announces that it is not concave.
It's not clear to me why the discrepancy
This is my log (in a picture format)
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