[R] Trees

2006-01-23 Thread Stephen 
Hi.,
 
I would like to conduct a CHAID tree analysis - Chi-square Automatic
Interaction Detector.
 
From what I can make out from MASS, tree, rpart, and a quick search it
isn't available 
as a package. 
 
Is that correct or have I missed it? Has anyone an available
implementation of it?
 
Thanks
 
Stephen

Nana Mail http://mail.nana.co.il - Get Your Free Personal Outlook 2003
Now

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Re: [R] Trees

2006-01-23 Thread Torsten Hothorn 

On Mon, 23 Jan 2006, Stephen wrote:

 Hi.,

 I would like to conduct a CHAID tree analysis - Chi-square Automatic
 Interaction Detector.

 From what I can make out from MASS, tree, rpart, and a quick search it
 isn't available
 as a package.

 Is that correct or have I missed it?

correct, it is not available out-of-the-box.

 Has anyone an available implementation of it?

if you aim at unbiased variable selection you might want to checkout the
`party' package, especially the `ctree' function.

Best,

Torsten


 Thanks

 Stephen

 Nana Mail http://mail.nana.co.il - Get Your Free Personal Outlook 2003
 Now

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