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Re: st: Not concave in xtfrontier


From   vinish kathuria <vinish67@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Not concave in xtfrontier
Date   Thu, 12 Jul 2007 23:56:51 +0100 (BST)

Thanks Scott!

If I don't suppress constant term, for few it
converges but for few it still shows - not concave.

However, the model also requires suppressing constant
term - as it is in difference!

Vinish

--- Scott Merryman <scott.merryman@gmail.com> wrote:

> Does it converge if you do not suppress constant
> term?
> 
> Scott
> 
> 
> On 7/10/07, vinish kathuria <vinish67@yahoo.com>
> wrote:
> > 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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