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st: Number of instruments needed for growth curve model using xtivreg?


From   David Torres <writeon4truth2@msn.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Number of instruments needed for growth curve model using xtivreg?
Date   Fri, 6 Dec 2013 15:30:48 -0500

Hello, Statalisters,

I'm using xtivreg to carry out a growth model that includes a quadratic term.  One of my time-varying predictors is endogenous, so I've instrumented for it using one other variable.  Someone questioned me, though, whether it was okay to only include one instrument given that I want to know the impact of the endogenous predictor on the intercept, the linear growth term, and the quadratic growth term?  Do I need three instruments in this case?  We're both concerned because we've never seen an IV estimation in the context of HLM.

Help.

Thanks,
Diego 		 	   		  
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