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st: RE: xtfrontier and conditional inefficiency effects


From   "Scott Merryman" <smerryman@kc.rr.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: xtfrontier and conditional inefficiency effects
Date   Thu, 21 Sep 2006 07:28:03 -0500

You could include firm dummy variables with -frontier, cm()- in order to
exploit the panel nature of the data.

Scott

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] On Behalf Of Senanu Asamoah
> Sent: Wednesday, September 20, 2006 3:16 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: xtfrontier and conditional inefficiency effects
> 
> I am trying to estimate technical efficiency, for stochastic frontier
> analysis, conditional on a set of z variables, for panel data.
> 
> For cross-section, I understand the command:
> frontier y x1 x2, distr(tnormal) cm (z1 z2)
> will do the trick.
> 
> However, for the command xtfrontier I am able to get the technical
> efficiency estimates, but not sure how to condition those on a set of z
> variables as is available with the frontier command.  Is there a code to
> compute this in stata?
> 
> xtfrontier y x1 x2, tvd [want to condition te on a set of z variables].
>  Please help.
> 
> Sen.



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