Dear Arun and Rui, thank you for replying, your commands are very helpful.
Before you replied, Ive solved the issue with the following approach (for
quartiles):
myFun <- function(x, GENDER)
{
x.male <- cut(x, labels=c(1:4), breaks=quantile(split(x,GENDER) $ '1',
seq(0,1,.25), na.rm=TRUE),include.lowest = TRUE)
x.female <- cut(x, labels=c(1:4), breaks=quantile(split(x,GENDER) $ '2',
seq(0,1,.25), na.rm=TRUE),include.lowest = TRUE)
ifelse(GENDER==1, x.male, x.female)
}
Robert
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