R help - Apr 2010 - About Random Forests,ROC,Misclassified

Hi,guys. i got a few questions about the R code during my self study of this
language. plz help me ^_^

for example,use the dataset Vanveer.4000 in library(MASS),

1.if i used the first 300 genes, how to find the single trees and random
forests by using R? And how to see their classification performance?

2.how to compute the error rate by using 10-fold cross validation? and how
to produce a ROC curve?

3.how to find the numbers of "good" outcome are misclassified?

Thank you very much for your help.


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This might help:

   http://www.jstatsoft.org/v28/i05/paper

Max

On Sun, Apr 18, 2010 at 1:24 PM, kevinzy <kevin.nuemann at googlemail.com>
wrote:
>
> Hi,guys. i got a few questions about the R code during my self study of
this
> language. plz help me ^_^
>
> for example,use the dataset Vanveer.4000 in library(MASS),
>
> 1.if i used the first 300 genes, how to find the single trees and random
> forests by using R? And how to see their classification performance?
>
> 2.how to compute the error rate by using 10-fold cross validation? and how
> to produce a ROC curve?
>
> 3.how to find the numbers of "good" outcome are misclassified?
>
> Thank you very much for your help.
>
>
> --
> View this message in context:
http://n4.nabble.com/About-Random-Forests-ROC-Misclassified-tp2014981p2014981.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 

Max