xtfrontier estimates a model in which the "inefficiency" error is
N(mu,sigma2) truncated at zero.
Is there a way to constrain mu=0 so that a "half normal" model is estimated?
__________________________________
Andrew Chesher
Centre for Microdata Methods and Practice
http://cemmap.ifs.org.uk
Department of Economics
University College London
phone: +44 (0) 207 679 5857
fax: +44 (0) 207 916 2775
email: [email protected]
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