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st: cumulative summation


From   James Bernard <jamesstatalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: cumulative summation
Date   Tue, 26 Feb 2013 15:08:00 +0800

Hi all,

I have used the sum function to calculate a variable in  a panel data.

Firm        Year      ties
-----------  ----------    -------
A             1990      1
A             1990       2
A             1991       1
B             1990       0
B             1990       1
B             1990        3
C             1990        0
C             1991        0
C             1992        0

The issue is that the variable ties which is the number of ties a firm
has formed in a year is a cumulative sum of something and, therefore,
for a company like A the final number of ties in year 1990 should be
2. I need the program to write the same number (final value of the
cumulative sum) instead of 1.


I appreciate your thoughts.

Thanks,
james
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