[R] randomForest: more than one variable needed?

[Liaw, Andy]

With only one `x' variable, RF will be identical to bagging.

This looks like a bug.  I will check it out.

Andy

> From: Hui Han
> 
> I agree with you about the less practical meaning of this sample of 
> the extreme case. I am just curious about the "grammar" syntax of 
> randomForest.
> 
> Thanks.
> Hui
> 
> On Tue, Apr 13, 2004 at 05:29:06PM +0200, Philippe Grosjean wrote:
> > I don't see much why to use random forest with only one 
> predictive variable!
> > Recall that random forest grow trees with a random subset 
> of variables "in
> > competition" for growing each node of the trees in the 
> forest... How do you
> > make such a random subset with only one predictive 
> variable? there is no
> > point here!
> > 
> > Philippe Grosjean
> > 
> > -----Original Message-----
> > From: r-help-bounces at stat.math.ethz.ch
> > [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Hui Han
> > Sent: Tuesday, 13 April, 2004 17:16
> > To: r-help at stat.math.ethz.ch
> > Subject: [R] randomForest: more than one variable needed?
> > 
> > 
> > Hi,
> > 
> > I am doing feature selection for my dataset. The following is
> > the extreme case where only one feature is left. But I got
> > the error below. So my question is that do I have to use
> > more than one features?
> > 
> > sample.subset
> >   udomain.edu hpclass
> > 1        -1.0     not
> > 2        -1.0     not
> > 3        -0.2     not
> > 4         1.0      hp
> > 5         1.0      hp
> > > randomForest(hpclass ~., data=sample.subset, importance=TRUE);
> > Error in if (n == 0) stop("data (x) has 0 rows") :
> >         argument is of length zero
> > 
> > Best regards,
> > Hui Han
> > Department of Computer Science and Engineering,
> > The Pennsylvania State University
> > University Park, PA,16802
> > email: hhan at cse.psu.edu
> > homepage: http://www.cse.psu.edu/~hhan
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide!
> > http://www.R-project.org/posting-guide.html
> > 
> > 
> > 
> 
> 
> Hui Han
> Department of Computer Science and Engineering,
> The Pennsylvania State University 
> University Park, PA,16802
> email: hhan at cse.psu.edu
> homepage: http://www.cse.psu.edu/~hhan
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
> 
> 


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