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| From | mohamm52@msu.edu |
| To | statalist@hsphsun2.harvard.edu |
| 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. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/