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st: ivreg2 running OLS

From   "Nirina F" <>
Subject   st: ivreg2 running OLS
Date   Thu, 20 Sep 2007 06:33:52 -0400

Hello again,

I run ivreg2 and it is telling me that my endogenous variable is
collinear with the instruments and then it is running OLS but still
reporting Sargan test of overid.

I find it wierd since this is what I would have expected it to do:

drop the collinear variables from the list of  instruments and then
still run 2SLS. Could anyone please help on what could be the trick?

Many thanks in advance,

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