Hi,
I am trying to estimate an earnings equation for self-employed and
employed. To eliminate the selection bias I intend to use a double
probit model. Stata seems to offer two commands for this task,
heckprob and biprobit. I am not sure which one I should use.
Heckprob seems to be more appropriate for my model. But, in any case I
need to get two selection terms (lambda s) for my earnings equations.
With heckprob command I only get the rho term but lambdas. I can
neither add the main equation (earnings eq.) with heckprob command.
Anyone familiar with the problem please write me.
Thank you
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