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st: -sfcross- and -sfpanel- updated on SSC


From   Federico Belotti <f.belotti@gmail.com>
To   Stata List <statalist@hsphsun2.harvard.edu>
Subject   st: -sfcross- and -sfpanel- updated on SSC
Date   Mon, 3 Jun 2013 13:43:08 +0200

With many thanks as ever to Kit Baum, -sfcross- and -sfpanel- has been updated on SSC.

Melvyn Weeks and Daniel Singh discovered a bug in the post-estimation
computations of (in)efficiency after -sfpanel- estimation using -model(bc92)- and 
-model(kumb90)-. Many thanks to them. 

Moreover, in a previous thread on Statalist (see link below), there was a discussion 
on cost efficiency scores greater than one for the -xtfrontier- command.

http://www.stata.com/statalist/archive/2013-05/msg00105.html

To remove any doubt on that matter, the updated version of -sfpanel- and -sfcross- 
(and related post-estimation commands) follow the definitions of technical and 
cost (in)efficiency given in Kumbhakar and Lovell (2000).

-ssc install sfcross, replace- and -ssc install sfpanel, replace- to get the updated versions.


References
Kumbhakar, S., and C. Lovell. 2000. Stochastic frontier analysis. Cambridge University Press.


Best,
Federico


-- 
Federico Belotti, PhD
Research Fellow
Centre for Economics and International Studies
University of Rome Tor Vergata
tel/fax: +39 06 7259 5627
e-mail: federico.belotti@uniroma2.it
web: http://www.econometrics.it


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