使用cut（）函数进行R编程将变量分为3类

Question

I a have a dataframe called wine with variables among which is the variable Spice of integer type. I would like to split this variable ( Spice ) using the cut() function into 3 classes ( <2; between 2 and 2.5; >3 ).

Answer 1

Assuming you mean spice is numeric (and not integer, which would only fall between 2 and 2.5 if it was exactly two), it might be hard to do with just cut if you're trying to be left and right inclusive.

You can get close with something like

dat <- data.frame(spice=5*runif(100))

dat$lvl <- cut(dat$spice, breaks=c(0,2,2.5,1e6), right=FALSE)

dat$lvl <- as.factor(as.numeric(dat$lvl))

though if the value for spice is exactly 2.5 it will be placed in group 3 instead of group 2.