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Re: st: Not concave in xtfrontier

From   "Scott Merryman" <>
Subject   Re: st: Not concave in xtfrontier
Date   Thu, 12 Jul 2007 16:30:23 -0500

Does it converge if you do not suppress constant term?


On 7/10/07, vinish kathuria <> wrote:

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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