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st: xtfrontier and conditional inefficiency effects

From   "Senanu Asamoah" <>
To   <>
Subject   st: xtfrontier and conditional inefficiency effects
Date   Wed, 20 Sep 2006 16:16:06 -0400

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.


Senanu Y. Asamoah, Ph.D.
Economist, Research Staff
CNA Corp.
(703) 824-2182
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