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Re: st: Levpet, program error

From   "Brian P. Poi" <>
To   "''" <>
Subject   Re: st: Levpet, program error
Date   Thu, 12 Nov 2009 08:46:30 -0600 (CST)

On Wed, 11 Nov 2009, Solorzano Mosquera, Jenniffer wrote:

. levpet lnUSY if panel==3, free(lnUSL) proxy (lnUSM) capital(lnUSK) revenue
no observations
error #2000 occurred in program nllp_bs_gmm

Any ideas about the program nllp_bs_gmm?

With the -if- condition 'if panel==3', are you trying to fit a model to just one panel (firm) of your dataset? That won't work, because these estimators require observations on multiple firms.

If that's not the problem, you can send your dataset directly to me (, and I'd be happy to help you resolve the issue.

   -- Brian Poi (coauthor of -levpet-)
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