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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 04:30:35 -0700 (PDT)

Thank you very much for your help, but last command
results in removing  
ALL my observations. Maybe I am doing smth wrong?


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

Kind regards,
Olga


 
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