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st: levpet


From   Sudeshna Pal <sudeshna.pal@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: levpet
Date   Fri, 30 Jul 2010 09:39:05 -0700 (PDT)

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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