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st: Instruments over-identified

From   "" <>
Subject   st: Instruments over-identified
Date   Fri, 27 May 2011 15:19:18 +0200 (CEST)

Dear Statalist,

I need to make my model over-identified, starting with two instruments, since 
I want to interact my endogenous variable with some other variables. I read in 
previous discussions that it is possible to create new instruments by making 
some transformation on the available ones. Could you please indicate to me some 
references thus I can study how to adapt properly this tecnique to my model?

Thank you in advance,

Best Regards
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