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.
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