[R] coding of categories in rpart
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Apr 28 17:16:11 CEST 2004
On Tue, 27 Apr 2004, Prabhakar Krishnamurthy wrote:
> I am using rpart to derive classification rules for customer segments.
> I have a few categorical variables in the set of independent variables.
> For instance,
> Account Size can be (Very-Small, Small, Medium, Large, V-Large)
> Rpart seems to encode these categories into: a,b,c,d,e
It doesn't. That is one output representation (of several), of the factor
> The results are expressed in terms of the encoded values.
> How do I find out what encoding was used by rpart. i.e.
> what categories in my input set do a, b, c,... correspond to?
By reading the documentation! E.g. ?text.rpart.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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