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st: RE: predict in xtfrontier


From   "Vidya Mahambare" <MahambareV@Cardiff.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: predict in xtfrontier
Date   Tue, 25 Nov 2003 14:15:35 +0000

Hello, one more questions. Here it goes.

I have now created estimates for TE for each sector following Nick Cox's
suggestion. I would now like to compute TE for  each firm in a sector relative
to maximum TE in that sector in a particular year. 

I am not sure how to proceed, mainly due to the lack of understanding of
programming. 

thanks
Vidya

> 

>>> n.j.cox@durham.ac.uk 11/25/03 11:09am >>>
As I understand it, you are fitting a separate 
model for each sector, and want to pool the predictions. 

Here is one way to do that: 

levels sector, local(S) 
gen te = . 
foreach s of local S { 
	capture drop work 
	qui xtfrontier 
		logrgva time logwage logplnt if sector == `s', tvd 
	predict work if e(sample)  
	qui replace te = work if sector == `s' 
} 

Nick 
n.j.cox@durham.ac.uk 

Vidya Mahambare

> I am using 'xtfrontier' command for a C-D production 
> function for 13 sectors as
> follows:
> bysort sector: xtfrontier logrgva time logwage logplant, tvd
> 
> When I try to generate 'predict te', it is generated only 
> for the last sector.
> 
> Can I add any subcommand to create estimates of TE for each 
> of the sectors? or
> do I have to run xtfrontier for each sector and generate te.
 

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