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st: How does clustering in the first-stage impact IV estimates?
From 
 
"Rogger, Daniel" <[email protected]> 
To 
 
"[email protected]" <[email protected]> 
Subject 
 
st: How does clustering in the first-stage impact IV estimates? 
Date 
 
Wed, 12 Jun 2013 10:17:23 +0000 
Dear Statalisters,
I am estimating a two-stage least squares instrumental variables regression using ivregress and choosing the 2sls option.  For much of my analysis I am clustering at one level, say by clustervar X.  If I believe I should cluster my first stage regression by another level, say clustervar Y, how should I proceed?  Does how I cluster in the first stage have any impact on my second stage results?
With best wishes,
Dan
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