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Re: st: Drop subjects from a panel


From   Klaus Pforr <kpforr@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Drop subjects from a panel
Date   Wed, 08 Feb 2012 23:26:22 +0100

Dear Ayman,

It depends on what you want to do. Do you want to drop cases with a specific combination of a covariate and the process time? Or do you want to drop a specific element in the sequence of measurements for each panel group? Is the "2" from <time==2> different for each panel group?

The simple answer I gave you does the first for a specific static combination (I guess you knew that already). Anything else depends on what you want to do.

Klaus


Am 08.02.2012 22:28, schrieb Ayman Farahat:
Thanks Klauss;

One question : Wouldnt this just remove the observation at time==2 while leaving the observations at different times?
Ayman



----- Original Message -----
From: Klaus Pforr<kpforr@googlemail.com>
To: statalist@hsphsun2.harvard.edu
Cc:
Sent: Wednesday, February 8, 2012 12:52 PM
Subject: Re: st: Drop subjects from a panel

<>

Hello Ayman,

try
<drop if covariate==0&  time==2>

best

Klaus

Am 08.02.2012 21:36, schrieb Ayman Farahat:
Hello ;

    I have a panel data. I would like to remove all subjects that had a certain co-variate at a specific time.

For example, drop all subjects that had a covariate==0 for time==2.
Any help greatly appreciated.

Thanks
Ayman


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Klaus Pforr
MZES AB - A
Universität Mannheim
D - 68131 Mannheim
Tel:  +49-621-181 2797
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