hello!
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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