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st: predict with xtfrontier


From   "Dascha Orlova" <dascha.or@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   st: predict with xtfrontier
Date   Mon, 30 Jul 2007 15:24:55 +0200

Hi,

I'm estimating a cost function with xtfrontier. After the estimation I predict the efficiency scores using predict te_scores,te.

The predicted scores are in the intervall (1;eternity) and hard to interprete though. 

The subject has been discussed here already and I've read:
http://www.stata.com/statalist/archive/2005-06/msg00578.html
and
http://www.stata.com/statalist/archive/2007-06/msg00926.html.

However these threads don't really solve my problem: which way do I compute the MEAN efficiency to make it comparable to other studies? Invertation affects the distribution of the scores, so the results vary between:
E(inverse te_scores)
and 
1/(E(originally predicted te_scores))

I hope, I managed to explain my problem :-)

Thank you very much in advance...




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