[R] Splitting a categorical variable into multiple variables

[Bert Gunter]

If I understand what you mean, just recode them.

z <- factor(letters[1:3])
z
zz <- factor(ifelse( z %in% c("a", "b"),"d" ,z))
zz

Cheers,
Bert

On Fri, Aug 9, 2013 at 7:10 AM, Claus O'Rourke <claus.orourke at gmail.com> wrote:
> Hello R-Help,
> I have a variable with > 32 levels and I'd like to split this into two
> variables such that both new variables have >= 32 variables. This is
> to handle the limit of 32 level predictor variables in R's Random
> Forest implementation. Might someone be able to suggest an elegant way
> to do this? I've tried googling for this, but haven't hit the right
> search terms.
>
> Regards
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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