st: truncreg with panel data

[Anita <anita.metzger@vtxmail.ch>]

Dear Statlist members

I would like to estimate a model based on Cragg (1971) which contains in 
a first step a probit estimation and in a second step a regression part 
for all positive outcomes of the probit estimation.
I learned that I habe to estimate the second step with truncreg to 
account for the truncation. Unfortunately I am working with a panel 
dataset and I nowhere found a command integrating fixed/ or random 
effects. Is there a possibility to do it, when not, why?

Thanks a lot
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