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Re: st: xtfrontier


From   [email protected]
To   [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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