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st: RE: balanced sub-panel to test for selection bias


From   Olga Lyashevskaya <olgalyashevskaya@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: RE: balanced sub-panel to test for selection bias
Date   Thu, 24 May 2007 09:25:48 -0700 (PDT)

Thank you very much, it works!

After somoe changes I applied the following:

egen nfarm = count(farm),by(year)
summarize nfarm, meanonly
sort year
by year: keep if nfarm == `r(max)'

Kind regards,
Olga


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