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Re: st: Problems using predict in xtfrontier


From   "Scott Merryman" <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Problems using predict in xtfrontier
Date   Tue, 28 Aug 2007 12:23:39 -0500

Are you sure they should vary?  I don't have books with me but isn't
eta summed over all the time periods (for each individual) for
-predict var, u- and predict var, m- making the predictions time
invariant?

Scott


On 8/28/07, Dascha Orlova <dascha.or@gmx.de> wrote:
> Dear Statalisters,
>
> I'm estimating a cost efficiency frontier with panel data in Stata 9 using:
> xtfrontier [depvar] [indepvar], tvd cost.
> My estimate for eta is significant.
>
> The resulting efficiency scores do vary with time if I use
> predict newvar, te.
>
> But the results DO NOT vary with time if I use
> predict newvar, u or predict newvar, m.
>
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