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 <[email protected]> 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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