st: Different selection variables for different subpopulations in the sample

[Dimitrije Tišma <dimitrijetisma@gmail.com>]

Hi,

I was wondering if there exists some Stata command which would allow
me to select different selection variables when working with Heckman
selection models. For instance, let's say I am working with the
textbook example of wages. I may assume that number of kids is the
variable that determines selection of women into employment, while
some other variable would be selection variable for men. Or,
alternatively, I could assume that there is selection bias only for
women, while no selection is at work for the other part of the sample.
Many thanks in advance,

Dimitrije
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