file$Efficiency <- cut(file$Duration, breaks=c(-1,5,15,30,200), labels=c("Above Par", "Par", "Below Par", "Unacceptable"))
Here is a little example of data from me:
x <- c(0,1, 4:6, 14:16, 29:31)
y <- cut(x, breaks=c(-1,5,15,30,200), labels=c("Above Par", "Par", "Below Par", "Unacceptable"))
data.frame(x=x, y=y)
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solved Explanation for If statement in R