st: xtpoisson with endogenous covariate?

["ALICE DOBSON" <alice_dobson@hotmail.com>]

Hi all,
I use Stata 9.1. What can I do if my count dependent variable is 
simultaneously determined with a continuous covariate in a panel data 
setting?  In such a case my xtpoisson estimates would be biased. I have good 
instrumental variables in the data. Should I ignore my count data dependent 
variable and simply use xtivreg2 instead?
Best,
Alice

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