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st: updated F-stat in -ivreg2, ffirst- ?


From   <anne_yang@cox.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: updated F-stat in -ivreg2, ffirst- ?
Date   Wed, 3 Jun 2009 16:09:07 -0400

Hi, when I re-ran some old -ivreg2- models using a newly downloaded -ivreg2- procedure, I found the F-statistics reported in the first stage are different now. 

Is it becuase if I specify "robust", this new version -ivreg2- produces robust F-stat (as noted in the new output), while the old -ivreg2- that I downloaded about three years ago did not (even though I also specified "robust" when I ran the old one)?

Thanks,

Anne
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