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Re: st: Grouping firmid or not to tsset data ?
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Grouping firmid or not to tsset data ?
Date
Mon, 20 Jan 2014 21:16:19 +0000
If you really are typing
gen firmid = group(permid)
then that triggers the undocumented Stata function -group()-. That's
going to be very wrong for you. With
egen firmid = group(permid)
you might try
egen double firmid = group(permid)
instead.
Nick
[email protected]
On 20 January 2014 19:03, Abdalla, Ahmed <[email protected]> wrote:
> Dear Statalist
> I have a panel id (permno) and two time variables (yr) and (mth) and want to tsset my panel based on permno yr mth
> I run:
> gen timeid = ym(yr, mth)
> gen firmid=group(permno)
>
> tsset firmid timeid
> //I get the error message -repeated time values within panel
>
> when I run tsset permno timeid
> //it works properly.
>
> I changed my data set, and used another data set to rule out any problems with my data, however still get the same results !
>
> Can I tsset when only the time variables are grouped in one timeid and the firmid is not grouped ? Is it correct?
>
> Thanks
>
>
>
>
>
>
>
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