I'm trying to categorize a continuous variable (yes, I know that's horrible,
but I'm trying to reproduce some exercises from a textbook) and don't really
know an efficient way to do this.
I have a data frame that looks like:
surv_time relapse sex log_WBC rx
1 35 0 1 1.45 0
2 34 0 1 1.47 0
3 32 0 1 2.20 0
4 32 0 1 2.53 0
And I'm trying to categorize log_WBC into:
(0-2.30) = "low"
(2.31-3.00)= "medium"
(>3.00) = "high"
I've used an ifelse statement such as:
anderson$log_WBC <- ifelse(anderson$log_WBC<2.30,"low",anderson$log_WBC)
Is there a way to use "greater than" "less than" syntax within the context of
an ifelse statement? Or can someone point me to a function that will do this
easier.
Many Thanks,
Patrick
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