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st: xtfrontier error


From   Raiqah Kamil <raiqaha@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: xtfrontier error
Date   Sun, 13 Nov 2005 17:49:34 -0800 (PST)

Hello,

I am trying to estimate the producer specific
technical efficiency  (time invariant) using a
firmlevel panel data. When I use the "xtfrontier"
command as outlined in the help, stata is returning an
error:
no observations
I haven't worked with the panels earlier. Can anyone
suggest what is the nature of problem here? I would
appreciate any help on this.

thanks,
Kamil


		
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