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Re: st: heteroskedastic panel frontier


From   Scott Merryman <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: heteroskedastic panel frontier
Date   Thu, 10 Jun 2010 04:43:14 -0500

You could estimate a fixed-effects model using firm specific dummies
and -frontier-.

See also:  http://www.stata.com/statalist/archive/2003-07/msg00349.html

Scott


On Wed, Jun 9, 2010 at 4:21 PM, Manzur Quader <manzurquader@gmail.com> wrote:
> Hye,
>
> I am using stochastic frontier model to calculate agency cost of firms
> using Tobin's Q as dependent variable.I have got data of 1200 firms
> over 3 to 29 years.But,whenever I am using xtfrontier I am getting
> very low efficiency level(below 40%,which is very low compared to the
> literature) and this is probably due to heteroskedasticity.If I use
> frontier on the pooled data or on different cross sections by year
> conditional on uhet,I am getting much better result.
>
> Can you please tell me is there any way to incorporate
> heteroskedasticity if I want to use xtfrontier for my panel?I know
> that the Battesse and Coelli(1995) model can be estimated in stata,but
> is there any way I cam parameterize the mean efficiency in terms of z
> simultaneously?Or is there anything like uhet for panel frontier?
>
> Please advise.
>
> Regards,
> Syed.
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