[R] How to interactively create manually guided Decision Tree

Bert Gunter gunter.berton at gene.com
Fri Jun 14 18:18:15 CEST 2013

You need to do some reading, both about decision trees and R!

What you need to do for R is to use cut() on Age (?cut) to create a
new categorical variable, ageCat, say, and then use that in your tree
building instead of Age.


On Fri, Jun 14, 2013 at 7:24 AM, Neelesh Gupta <neelesh0 at gmail.com> wrote:
> I am new in using R. I want to know all about building decision tree model
> in R.
> Few options which I searched are rpart and rattle to build a decision
> tree.Both the functions are giving me splits which are  statistically
> appropriate.
> But I am not able to figure out how to  change those splits as per my
> business requirement.
> for example : the automatic split of Age by using rattle is > 30 and <= 30
> but I want a  split of <= 20 , 21-30 , 30-50 and >= 50
> I also want to know how to know the predictive strength of each variable
> after each split so that I can choose which variable should come next in my
> list.
> I
> Thanks in advance
>         [[alternative HTML version deleted]]
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Bert Gunter
Genentech Nonclinical Biostatistics

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