[R] Running randomForests on large datasets

Liaw, Andy
Wed, 27 Feb 2008 13:24:47 -0000

There are a couple of things you may want to try, if you can load the
data into R and still have enough to spare:

- Run randomForest() with fewer trees, say 10 to start with.

- Run randomForest() with nodesize set to something larger than the
default (5 for classification).  This puts a limit on the size of the
trees being grown.  Try something like 21 and see if that runs, and
adjust accordingly.

HTH,
Andy


From: Nagu

> Hi,
>
> I am trying to run randomForests on a datasets of size 500000X650 and
> R pops up memory allocation error. Are there any better ways to deal
> with large datasets in R, for example, Splus had something like
> bigData library.
>
> Thank you,
> Nagu
>
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