Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Re: correction variance- cov matrix panel data sample selection


From   "Rodrigo A. Alfaro" <raalfaroa@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: correction variance- cov matrix panel data sample selection
Date   Sun, 13 May 2007 22:54:36 -0400

Did you try -heckman-??
----- Original Message ----- From: <ncdcta00@uniroma2.it>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, May 13, 2007 2:06 PM
Subject: st: correction variance- cov matrix panel data sample selection



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

*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index