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Re: st: How to drop observations in panel
From
Islam Abdeljawad <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: How to drop observations in panel
Date
Sat, 6 Aug 2011 04:12:35 -0700 (PDT)
It works. will check if i should use it in my regression. Thanks Nick
----- Original Message -----
> From: Nick Cox <[email protected]>
> To: [email protected]
> Cc:
> Sent: Saturday, August 6, 2011 4:16 PM
> Subject: Re: st: How to drop observations in panel
>
> bysort panelid : drop if _N < 3
>
> Whether this is a good idea is a different matter.
>
> Nick
>
> On Sat, Aug 6, 2011 at 6:36 AM, Islam Abdeljawad
> <[email protected]> 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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