R help - Nov 2007 - anyway to force rpart() to include a specific predictor

If I understand correctly, rpart() will pick predictor at each node
automatically. I am wondering if there is a way to force rpart()
including a specific predictor. The reason I am asking is that I'd
like to use rpart() to detect interaction terms for some variables.

Thanks.

just my2cent:

could you make a derived feature by including the desired predictor in
each of features you use to present to rpart?

(by the way, if I can understand your question right, I assume rpart
picks only one predictor each time at each node)

Best,

Weiwei

On 11/26/07, Wensui Liu <liuwensui at gmail.com>
wrote:
> If I understand correctly, rpart() will pick predictor at each node
> automatically. I am wondering if there is a way to force rpart()
> including a specific predictor. The reason I am asking is that I'd
> like to use rpart() to detect interaction terms for some variables.
>
> Thanks.
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
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