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st: xtfrontier
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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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