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st: xtfrontier


From   [email protected]
To   [email protected]
Subject   st: xtfrontier
Date   Sat, 13 Jul 2013 12:35:32 -0400

Dear Statalist,

I recently used xtfrontier for my paper and I got some problems. I would like to estimate the technical efficiency of rice farms in some provinces between 1993-2012 using panel data. I have output as a dependent variable and each labor, fertilizer, land, seed and capital as independent variables. What makes me worry is that, for each province I have the same value of the technical efficiency for all the years and all the values are between 0.99-1.0 which is hard to believe.
I used the following commands
xtset   province   year
panel   variable:   province (strongly balanced)
time   variable:   year, 1993 to 2012
delta:    1 unit
xtfrontier  lny  lnx1  lnx2  lnx3  lnx4  lnx5,  tvd
predict efficiency, te

Any suggestion please.

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