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RE: st: Panel with minimum observations


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Panel with minimum observations
Date   Sun, 15 Mar 2009 16:37:40 -0000

-egen- is a slip here for -gen-. But you could do this without any new variables at all. 

bysort myid : drop if _N <= 2 

That said, I support Joseph's last paragraph strongly. 

Nick 
n.j.cox@durham.ac.uk 

Joseph McDonnell

. sort myid
. by myid: egen myN=_N
. drop if myN<=2

Of course, dropping is quite a severe step. You might prefer to use
one of the 'mark' commands or just use the 'if' qualifier.

Christian Bustamante

> I runing a panel data model with a large dataset. The panel is
> unnbalanced, so there is individuals with one or two observations. I
> don't want to use this observations in my model, how can I set it?

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