[R] J48 / Transform from numeric to nominal

[Ista Zahn]

Hi Patrick,
You didn't say how exactly you tried to "Discretize" your variable,
but have you tried

?factor
?as.character

?

Best,
Ista

On Mon, Feb 21, 2011 at 3:34 PM, Patrick Skorupka
<patrick.skorupka at gmx.de> wrote:
> Hi everyone,
>
> I am new to field of data mining as well as particularly using R respectively RWeka for writing my master thesis.
>
> I intend to create some specific J48 classification trees with the RWeka_classifiers_tree function. When I run the source code it says “cannot handle numeric class”. I therefore checked the arff-file and indeed there it says that the class variable is numeric although it only contains 0 and 1. In a next step I tried to Discretize my dataset but received the same error message. I googled the issue several times and also read about the filter function in WEKA but did not know how to use it and unfortunately did not find a proper solution.
>
> So – how can I transform my class variable from numeric to nominal / binary, I just don’t get it?! As I said, I am new to all of this and so appreciate anything little which helps!
>
> Pat
>
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org