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st: RE: levpet


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: levpet
Date   Fri, 30 Jul 2010 19:13:08 +0200

<>

Have you fully -update-d official Stata and -levpet- (user-written,
obtained via -findit-). This example works well for me:



***********
clear*
set obs 100
gen byte companyid=_n
expand 10
bys companyid: gen int time =_n+1988

tsset companyid time

gen logsales=log(runiform()*10)
gen logpowerfuel=log(runiform()*10)
gen loglabor=log(runiform()*10)
gen logmaterial=log(runiform()*10)
gen logcapital=log(runiform()*10)
gen revenue=log(runiform()*10)

levpet logsales, free(logpowerfuel loglabor)  /* 
*/  proxy(logmaterial) capital(logcapital) revenue
***********


HTH
Martin

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Sudeshna Pal
Sent: Freitag, 30. Juli 2010 18:39
To: statalist@hsphsun2.harvard.edu
Subject: st: levpet

I am working with STATA 10 and trying to use the levpet command in the
following way:



tsset companyid year
       panel variable:  companyid (strongly balanced)
        time variable:  year, 1989 to 2008
                delta:  1 unit


levpet logsales, free(logpowerfuel loglabor) proxy(logmaterial)
capital(logcapital) revenue

and I get the following error:
error #1 occurred in program nllp_bs_gmm
 error . . . . . . . . . . . . . . . . . . . . . . . .  Return code 196
        nl___________ refused query, rc= ___________;
        error # _________ occurred in program nl_________;
        Your nlfunc program did not work properly with the nl command

Any suggestion as to how to solve this?

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