cummulative sum

C

chiapas77

Hi everyone...

I need to figure out how to create a new variable that is a cumulative
sum of an existing variable with conditions. an example is below where
sumnumber is what i am trying to create. any help would be appreciated.
thanks.



subject visit number sumnumber
1000 1 5 5
1000 3 6 11
1000 4 2 13
1000 7 4 17
2000 1 0 0
2000 2 2 2
2000 3 0 2
3000 4 5 5
4000 1 2 2
4000 4 2 4
 
V

Vito

Try

=IF(A1=A2,D1+C2,C2) copied down

Where A1=Subject title, A2=first entry
C1=Number title, C2=first entry

And D2 is where you star entering your data
 
J

JE McGimpsey

Assuming that subject is sorted as your example shows:

D2: =C2
D3: =IF(A3=A2,D2+C3,C3)

copy D2 down as far as necessary.
 
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