On Nov 24, 2009, at 8:50 AM, Joel Fürstenberg-Hägg wrote:
Does any of you know how to make a decision tree when the data set
contains factors and numericals?
I've got a data frame with 3 columns, where y and x1 are numerical
and x2 contains factors. Is it possible to use the rpart package,
and in that case how? Otherwise, is there another alternative?
This is what I've tried so far
rpart(LT50_NA ~ Raf + Antho, data=decTreeNA, method=anova) # Have
tried method=class as well
Error in as.character(x) :
cannot coerce type 'closure' to vector of type 'character'
I do not think that error is arising because you have a factor on the
RHS of the equation. It would have been extremely surprising to find
that rpart would be complaining about encountering a factor. I think
it is because you failed to enclose anova with quotes. The message is
telling you that R encountered a function (a closure) where it was
hoping for a character variable.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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