Hi Andy,

Does the randomForest have a Cross Validation built-in to decide what is the
best number of trees or I have to find the best number manually by myself?

Thanks a lot!

Michael.

On 3/7/06, Liaw, Andy <andy_liaw@merck.com> wrote:
>
> Yes, I do know.  That's why I pointed you to the reference linked from the
> help page.
>
> BTW, there's also an R News article describing the initial version of the
> package.  Have you perused that?
>
> Andy
>
>  -----Original Message-----
> *From:* Michael [mailto:comtech.usa@gmail.com]
> *Sent:* Tuesday, March 07, 2006 9:27 PM
> *To:* Liaw, Andy
> *Cc:* R-help@stat.math.ethz.ch
> *Subject:* Re: [R] how to use the randomForest and rpart function?
>
> It did not have a legend showing on which color is for class1, which color
> is for class2, etc...
>
> I've read the R-help page.
>
> It lists a lot of options, but it did not say which ones are the key
> parameters that people use most for improving performance...
>
> Do you know?
>
> On 3/7/06, Liaw, Andy <andy_liaw@merck.com> wrote:
> >
> > As ?plot.randomForest says, it plots error rates.  In addition to
> > overall
> > error rates, it also plots error rates for each class.
> >
> > As to the options in randomForest, read about the options in the help
> > page
> > and the reference linked from the help page.
> >
> > Andy
> >
> > From: Michael
> > >
> > > When I plot the randomForest object, it shows a graph with 3
> > > lines, green, red and black, what's the meaning of these three lines?
> > >
> > > On 3/7/06, Michael < comtech.usa@gmail.com> wrote:
> > > >
> > > > Hi all,
> > > >
> > > > I am trying to play around with the randomForest function for
> > > > classification. I know its performance is great.
> > > >
> > > > I am currently using the default options.
> > > >
> > > > It has many options.
> > > >
> > > > How do I further tweak the options so that I can make its
> > > performance
> > > > even better?
> > > >
> > > > What are the options that are mostly used?
> > > >
> > > > Thanks a lot!
> > > >
> > > > M
> > > >
> > >
> > >       [[alternative HTML version deleted]]
> > >
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