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st: cluster robust SE options in 2SLS


From   "Shang E. Ha" <shang.ha@yale.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: cluster robust SE options in 2SLS
Date   Mon, 23 Mar 2009 09:24:05 -0400

Hi,

Can anyone look up the difference between these two standard error options; for
some reason they are producing slightly different standard errors.

  ivregress 2sls Y (Z = X), vce(cluster unit)

  ivreg Y (Z = X), robust cluster(unit)

Thanks!

Best,
Shang E. Ha
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