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st: Not concave in xtfrontier

From   vinish kathuria <>
Subject   st: Not concave in xtfrontier
Date   Tue, 10 Jul 2007 20:20:52 +0100 (BST)


I am using 'xtfrontier' for a C-D production function
for 24 sectors with data from 1994 to 2005.

While doing the analysis sector-wise, I am getting
log-likelihood 'not concave' for most sectors and is
not converging.

I am running the following command -
xtfrontier  ydiffrnce kdiffrnce feqty_new1 if industry
== i, tvd noconstant

What should I do?

Thanks and regards!

Vinish Kathuria

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