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Re: st: How to drop observations in panel

From   Nick Cox <>
Subject   Re: st: How to drop observations in panel
Date   Sat, 6 Aug 2011 09:16:33 +0100

bysort panelid : drop if _N < 3

Whether this is a good idea is a different matter.


On Sat, Aug 6, 2011 at 6:36 AM, Islam Abdeljawad
<> wrote:

> I am new to stata. I am working on an unbalanced data set where firm is the cross section identifier
>  and the time identifier is year.
> Estimation of the model will be based
>  on GMM-sys. some of my firms have only one or two years of observations.
> Should I drop these firms and how I can do it in stata. in other words, any firm
>  that have less than three years of data
> available (less than three observations) will not be included in the estimation.

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