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2005 Nov 27
5
creating a factor from other factors and ifelse
Hi, Given > sec98 <- factor(rep(1:2,3), labels=c("A", "B")) > sec99 <- factor(rep(2:1,3), labels=c("A", "B")) > sec99[c(2,5)] <- NA > sec00 <- factor( c( rep(1,3), rep(2,3) ), labels=c("A", "B")) > sec00[c(2,4)] <- NA > s...