st: Poisson Model with endogenous dummy variable

[agostino@unical.it]

dear all,
I would like to estimate a poisson model which includes an endogenous  
dummy variable. To be more precise, this dummy captures a "treatment  
effect", hence I would like to model the selection process that  
underlies it by a probit model, and use the fitted probabilities as  
instruments for the dummy.
Does anyone of you know a Stata command (either built in or not) that  
allows to estimate such a model?
thank you very much for any help
Maria

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