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Re: st: Unable to create lag variables in a panel dataset


From   Richard J Stoll <stoll@rice.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Unable to create lag variables in a panel dataset
Date   Fri, 14 Aug 2009 11:51:21 -0500 (CDT)

On Fri, 14 Aug 2009, Jabr, Wael M wrote:

>
> I thought there might be something wrong in my dataset and tried to use
> webuse abdata
> sort id year
> tsset id year
> (or xtset id year)
>

There may be an issue with your dataset, but there is nothing wrong with
what happened with abdata.

Abdata has 140 IDs.  You get a missing value for the first case for each
id (because there is no lag for that id prior to the first case.

------------------------------------------------------------------------
Richard J. Stoll * Professor of Political Science * Rice University
Dept. Political Science MS 24 * P.O. Box 1892 * Houston TX 77251-1892
E-mail: stoll@rice.edu * Tel: 713-348-3362 * FAX: 713-348-5273

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