Try this?
egen totobs = sum(1), by(lpnr)
Ying
> Hi,
>
> I have a panel data set in long format. The identifying record variable is
> called lpnr. Sometimes an observation occupies one row (that is, the
> variables for this variable is only measured once), somtimes it occupies
> two
> rows (measured twice), sometimes three (measured three times) and so on.
> However, I do not have a "time variable"--that is, a variable that counts
> how many times (i.e. the number of rows) an observation appears? How can I
> get this?
>
> Best regards,
>
> Christer
>
> ***************************************
> Professor Christer Thrane
> Department of Social Science
> Lillehammer University College
> 2626 Lillehammer, Norway
> + 47 61 28 81 70 (fax)
> + 47 61 28 82 47 (phone, work)
> + 47 61 25 53 04 (phone, home)
> + 47 92 29 54 39 (mobile)
>
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
Ying Wang
Ph.D. Candidate
Department of Public Policy
University of Maryland, Baltimore County
1000 Hilltop Circle
Baltimore, MD 21228
Tel(O): 410-455-6531
Tel(H): 410-747-6980
Fax: 410-455-1172
Email: [email protected]
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
