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st: grouping variable


From   Lars Folkestad <lfolkestad@health.sdu.dk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: grouping variable
Date   Thu, 12 Jan 2012 12:19:41 +0100

Dear List

After searching the web i will have to ask you - co-listers.

I have a dataset of patients and admissions.

Id sex hospital ward date_admission date_discharge


Data is in long format and i would like it to be reshaped to wide format.
Some participants have up to 150 different admissions.

My problem is that i dont have a unique grouping variable available (some
patients have been admitted to the same wards twice or more on the same
day)

I would like to do the following

Sort by id
Genereate a grouping variable 1-_n for each id
Reshape the lot to wide using i(id) j(groupvar)

But i cannot se how to to this.

Any other ways do reshape?

lars


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