Dear List,
I'll appreciate your help on this. I'm trying to create a variable as in
"cumsum_y.cond1" below, which should compute the cumulative sum of "y"
conditional on the value of cond==1.
set.seed(1)
d <- data.frame(y= sample(c(0,1), 10, replace= T),
cond= sample(c(0,1), 10, replace= T))
y cond cumsum_y.cond1
1 0 0 0
2 0 0 0
3 1 1 1
4 1 0 1
5 0 1 1
6 1 0 1
7 1 1 2
8 1 1 3
9 1 0 3
10 0 1 3
Thank you.
Regards,
Axel.
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