st: sample selection model with more than 2 choices

["mariam hassan" <maria_hassan@hotmail.com>]

Does Stata  do Heckman selection model with more than  2 choices?   I have 
more than 2 (actually 4) treatment groups.  I am not sure if the stata 
commands like heckman or heckprob can help me.  Are there modified versions 
of these commands to analyze selection model with more than 2 choices in 
stata.

Is there anaother way to calculate an estimator for the selection model with 
a mulltinomial selection.

Thanks
Mariam

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