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Re: st: xtfrontier
From
[email protected]
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[email protected]
Subject
Re: st: xtfrontier
Date
Mon, 15 Jul 2013 22:35:53 -0400
I tried the first alternative and I should try the second one.
Thank you for your help.
Rezgar,
Quoting Federico Belotti <[email protected]>:
It seems like your compounded error term is normal. In this case
there is no evidence of inefficiency (i.e all firms are technically
efficient). Alternatives are: 1) change model specification; 2) try
a different SF model (see -ssc describe sfpanel-).
HTH,
Federico
On Jul 13, 2013, at 6:35 PM, [email protected] wrote:
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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--
Federico Belotti, PhD
Research Fellow
Centre for Economics and International Studies
University of Rome Tor Vergata
tel/fax: +39 06 7259 5627
e-mail: [email protected]
web: http://www.econometrics.it
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