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st: Calculating running cumulative totals


From   Adam Chapman <chapman@deakin.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   st: Calculating running cumulative totals
Date   Wed, 16 Apr 2003 15:26:32 +1000

I wonder if anyone can help me with this...

I'm trying to calculate a running cumulative total for observations over the previous 12 months (cum12month). My data looks like:

# Obs Month Cum12month
2 1 2
4 2 6
3 3 9
1 4 10
2 5 12
4 6 16
2 7 18
1 8 19
5 9 24
3 10 27
2 11 29
4 12 33
5 13 36
2 14 34
3 15 34
2 16 35
4 17 37
etc

I'm sure this should be simple, but I can't work out an easy way to do this!

Many thanks,

Adam Chapman
Deakin University
Melbourne, VICTORIA

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