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Re: st: statistics in heckman


From   Christophe Kolodziejczyk <ck.statalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: statistics in heckman
Date   Fri, 29 Jul 2011 11:45:21 +0200

According to the manual /sigma should be the estimation of the
variance of the error term of the regression equation (see the manual
[R]Heckman p.648 for more detail)



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