Dear Patrick,
Take a look at ?cut for some ideas.

HTH,
Jorge


On Tue, Oct 13, 2009 at 3:37 PM, Richardson, Patrick <> wrote:

> 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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