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st: Sum of different values per column


From   Ziad El-Khatib <[email protected]>
To   [email protected]
Subject   st: Sum of different values per column
Date   Thu, 11 Dec 2008 13:26:40 +0100

Hi!
It is a cohort dataset, I want to sum one measurement over time, example below:

id            visit            pillcount           sumpc
101           1                 20                    .
101           2                 40                    .
101           3                 20                    80
102
etc..


Any tips how to create sumpc variable?


Thank you and best regards
ziad

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