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st: Standard Errors: regress vs. xtreg


From   Raphael Fraser <raphael.fraser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Standard Errors: regress vs. xtreg
Date   Mon, 3 Oct 2011 18:13:48 -0400

I am fitting the following models expecting to get the same standard
errors but they are slightly different. Can some one explain the
reason for this?


xi, noomit: regress  logsize i.days ozone dayXozone if year == 88, noconstant
xi, noomit: xtgee  logsize i.days ozone dayXozone if year == 88,
noconstant corr(independent)


Thanks,
Raphael
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