search for: vmean

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

...till 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$V3 == 0, FUN = sd) Problem comes from lapply(split(x$V2, interaction(x$V1, x$V3)), sd) specifically from > split(x$V2,...