[R] randomForest interaction detection

From: Retzer Joe <retzerjj_at_gmail.com>
Date: Wed, 30 Apr 2008 11:04:01 -0500

I've been using the randomForest package and getting very useful results for some time now.

I have a question pertaining to variable interactions. Since, unlike CART, no single tree representative of the solution is available, I was wondering if there was some way of discerning / identifying potential interactions in the data. I'll sometimes produce 2-way partial dependence plots but I select variables for these plots somewhat arbitrarily (i.e. without prior suggestion of interaction).

On Breimansí website he mentions an experimental approach to identify interactions. I know this has come up before, a couple years ago, and Andy Liaw noted it was not implemented in part due to its experimental nature.

I was wondering if anyone had a suggestion for detecting interactions using the randomForest package (In an analogous manner to Breimans' suggestion or another approach).

Many Thanks,
Joe Retzer

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