[R] cforest - keep.forest = false option? (fwd)

[Torsten Hothorn]

> ---------- Forwarded message ----------
> Date: Mon, 18 Jul 2011 10:17:00 -0700 (PDT)
> From: KHOFF <kuphoff at gmail.com>
> To: r-help at r-project.org
> Subject: [R] cforest - keep.forest = false option?
>
> Hi,
>
> I'm very new to R. I am most interested in the variable importance 
> measures
> that result from randomForest, but many of my predictors are 
> highly
> correlated. My first question is:
>
> 1. do highly correlated variables render variable importance 
> measures in
> randomForest invalid?
>

that depends on your idea of "valid". A number of papers 
published over the last years explore this question and
you should read the relevant literature first.

> and 2. I know that cforest is robust to highly correlated 
> variables,
> however, I do not have enough space on my machine to run cforest. 
> I used the
> keep.forest = false option when using randomForest and that solved 
> my space
> issue. Is there a similar option for cforest (besides 
> savesplitstats =
> FALSE, which isn't helping)

no. party was designed as a flexible research tool and is
not optimized wrt speed or memory consumption.

Best,

Torsten

>
> below is my code and error message
>
> Thanks in advance!
>
>> fit <- cforest(formula = y ~ x1 + x2+ x3+ x4+ x5+
> + x6+ x7+ x8+ x9+ x10, data=data, control= 
> cforest_unbiased(savesplitstats =
> FALSE, ntree = 50, mtry = 5)
>
> 1: In mf$data <- data :
>  Reached total allocation of 3955Mb: see help(memory.size)
> 2: In mf$data <- data :
>  Reached total allocation of 3955Mb: see help(memory.size)
>
>
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