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Re: st: Repeated time values within panel in levpet STATA output

From   "Brian P. Poi" <>
To   "" <>
Subject   Re: st: Repeated time values within panel in levpet STATA output
Date   Mon, 1 Mar 2010 08:27:13 -0600 (CST)

On Sun, 28 Feb 2010, Worku Gebeyehu wrote:

Dear Sir/Madam,

I am a PhD student doing my research on TFP of a panel of firms for the period 1996 to 2007 and the total number of observations are 8395. I have been trying to excute the following levpet command. levpet lny , free(lnl2 lnirm lnlrm) proxy (lnpower) capital (lnk) revenue justid grid i (eid) t (yr) reps (50)

However, I have been facing a problem of 'repeated time values within panel'. I have not faced a similar problem while estimating the same using FE, RE, OP, etc. I also tried to check the existence of dublications of years or firm idenity numbers using the stata 'dublicate report' command, I got a report of 'surplus=0'. Using set tr on, I found the following report. Because I am unable to understand what it means due to lack of knowldge in programming, I sent you with all the junk. I am sorry for that. I am stuck and strongly need your support.

If Worku would send the dataset directly to me (, I'd be happy to look into the cause of this problem.

  -- Brian Poi   (coauthor of -levpet-)
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