Axel Urbiz wrote
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 00 0
2 00 0
3 11 1
4 10 1
5 01 1
6 10 1
7 11 2
8 11 3
9 10 3
10 01 3
Thank you.
Regards,
Axel.
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is this what you are looking for ...
set.seed(1)
d - data.frame(y= sample(c(0,1), 10, replace= T),
cond= sample(c(0,1), 10, replace= T))
d$cumsum_y.cond1 = cumsum(d$y d$cond)
# Output
y cond cumsum_y.cond1
1 00 0
2 00 0
3 11 1
4 10 1
5 01 1
6 10 1
7 11 2
8 11 3
9 10 3
10 01 3
HTH
Pete
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