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st: cumulative summation
From
James Bernard <[email protected]>
To
[email protected]
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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