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Re: st: year dummies and time dummies reg.

From   Prakash Singh <>
To   statalist <>
Subject   Re: st: year dummies and time dummies reg.
Date   Wed, 19 Feb 2014 23:37:40 +0530

Dear Preethi, please check the data as the error massage says "you
probably have repeated observation of industry for some year". bys
year: tab industry command to see for which year the industry var
extra observation.


On Wed, Feb 19, 2014 at 10:19 PM, preethi <> wrote:
> Hi Sir/Madam,
>                    I am S. Preethi doing Ph.D on Vertical FDI Spillovers. I
> am using the Levinsohn-Petrin approach to estimate the TFP. I am using Stata
> for this. I have a doubt in this. When I try to run the levpet command, I
> get the error 'repeated time values within the panel'.
>                    My data set is like this. I have data for 13 industries
> and for each industry I have data for 11 years ie., 2001-2011. May be this
> is the reason why i get the error. From the previous studies I understand
> they have given year dummies and firm dummies.
>                    My question is how I should give the dummies. (Year id
> and Firm id). Kindly help me in this regard. Waiting for a reply. If I
> should give more information, kindly let me know.
> Regards,
> S. Preethi,
> Doctoral Scholar.
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