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

From   Federico Belotti <>
To   Stata List <>
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.

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.

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


Federico Belotti, PhD
Research Fellow
Centre for Economics and International Studies
University of Rome Tor Vergata
tel/fax: +39 06 7259 5627

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