I have a database with counts as dependent variable. This variable suffers from overdispersion problem. That's why I need to use negative binomial regression. Since I have an endogenous variable, I need to estimate the coefficient using an instrument variable. Is there a way/program/code that helps to estimate negative bbinomial model using an instrument? I am using STATA version 12. I have found IVPOIS address the issues of estimating coefficient using instrument for POISSON model. Could you help me please to modify the original code for IVPOIS for negative binomial models? Thanks.

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