Re: [R] Random Forest %var(y)

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Tue, 15 Jul 2008 09:49:15 -0400

Better late than never, I suppose:

The second column is simply the first column divided by the variance of the response that have been OOB up to that point (20 trees), times 100.

Best,
Andy

From: David Katz
>
> The verbose option gives a display like:
>
> > rf.500 <-
> + randomForest(new.x,trn.y,do.trace=20,ntree=100,nodesize=500,
> + importance=T)
> | Out-of-bag |
> Tree | MSE %Var(y) |
> 20 | 0.9279 100.84 |
>
>
> What is the meaning of %var(y)>100%? I expected that to
> correspond to a
> model that was worse than random, but the predictions seem
> much better than
> that on the o-o-bag estimates from predict(rf.500).
> --
> View this message in context:
> http://www.nabble.com/Random-Forest--var%28y%29-tp18295412p182
95412.html
> Sent from the R help mailing list archive at Nabble.com.
>
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