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st: ML with fixed effects and IV?

From   aslihan arslan <>
To   statalist <>
Subject   st: ML with fixed effects and IV?
Date   Wed, 18 May 2011 00:54:45 -0700 (PDT)

Dear Statalisters,

I am trying to estimate the determinants of different sources of household income simultaneously using a short panel data with t=2.  My main rhs variables of interest are endogenous, therefore I also need to use instruments. I realize these may be too many econometrically difficult estimations put together, but I'd appreciate if anyone has suggestions as to how to do an ML+IV+Fixed Effects regression for all income sources. 

I have seen Stephen Jenkins' post last November (, but seems like there is no follow-up on that panel-ml yet. Even if panel-ml was available, I'll still need to figure out how to do IV.  If I manually include the first step predicted values of endogenous rhs variables in a panel-ml program, would the "robust" standard errors also take care of the IV adjustment? 

Lastly, I already tried xtivreg2 (IV+GMM) giving up on the system estimation based on Christopher Baum's advice that reg3 is very limited and sur cannot handle IVs, and IV+GMM is advisable in that case (  These results did not make much sense and I thought taking into account the cross equation correlations of error terms in different income sources may improve results. 

Thanks in advance for any ideas,

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