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st: Collapseing by year


From   Lars Folkestad <lfolkestad@health.sdu.dk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Collapseing by year
Date   Fri, 20 Jan 2012 15:18:58 +0100

Dear List

I have a dataset where i have patient id and birth year.
I would like to have my data set up so that i have

Birth year  number_of_persons_born_this_year


I think i have to use the collapse function, but i cannot figure out how.

Thank you.

lars


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