Dear list,
I'm still trying to calculate the sd for V2 for
each group in V1 if V3 is '0':
> x
V1 V2 V3
1 A01 2.40 0
2 A01 3.40 1
3 A01 2.80 0
4 A02 3.20 0
5 A02 4.20 0
6 A03 2.98 1
7 A03 2.31 0
8 A04 4.20 0
# Work
x$vmean <- ave(x$V2, x$V1, x$V3 == 0, FUN = mean)
# Work
x$vsd2 <- ave(x$V2, x$V1, FUN = sd)
# Doesn't work
x$vsd <- ave(x$V2, x$V1, x$V3 == 0, FUN = sd)
Thank you for any help!
Patrick
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