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st: correction variance- cov matrix panel data sample selection


From   ncdcta00@uniroma2.it
To   statalist@hsphsun2.harvard.edu
Subject   st: correction variance- cov matrix panel data sample selection
Date   Sun, 13 May 2007 20:06:48 +0200

Dear statalist, Do you know some routine or reference for correction the standard error and variance matrix in panel data sample selection?
I calculate the inverse Mills' ratio every year, and after I put this in a simple regression for correctin the selection, but standard error and coefficientes are bias, so I need to corecct them.

Thanks for your help.
Best,
Catia

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