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st: No. of observations under GMM

From   lreine ycenna <>
Subject   st: No. of observations under GMM
Date   Wed, 8 Jun 2011 10:28:53 +0100


I run both OLS and GMM regressions using the same unbalanced panel dataset.
However, the no. of observations under GMM is sometimes one or two
less than the no. of observation under OLS.
How can I explain this?
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