[R] randomForest outlier

Birgit Lemcke birgit.lemcke at systbot.uzh.ch
Wed Jul 16 14:54:49 CEST 2008

Thanks anyway for your answer.
That was also an option that I took into account (no potential  
outliers) and I will have a look at the "value" section of ?outliers.


Am 16.07.2008 um 14:11 schrieb Liaw, Andy:

> Perhaps if you follow the posting guide more closely, you might get  
> more
> (useful) replies, but without looking at your data, I doubt there's  
> much
> anyone can do for you.
> The fact that the range of the outlying measures is -1 to 2 would tell
> me there are no potential outliers by this measure.  Please see the
> "value" section of ?outlier to see how this measure is computed.
> Andy
> From: Birgitle
>> Still the same question:
>> Birgitle wrote:
>>> I try to use ?randomForest to find variables that are the
>> most important
>>> to divide my dataset (continuous, categorical variables) in
>> two given
>>> groups.
>>> But when I plot the outlier:
>>> plot(outlier(rfObject, cls=groupingVariable),
>>> type="p",col=c("red","green")[as.numeric(groupingVariable)])
>>> it seems to me that all my values appear as outliers.
>>> Has anybody suggestions what is going wrong in my analysis?
>> Additonal remark
>> The scaling of the y-axis is quite small between -1 and 2.
>> -----
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Birgit Lemcke
Institut of Systematic Botany
University of Zurich
Zollikerstrasse 107
CH-8008 Zürich
Ph: +41 (0)44 634 8351
mail: birgit.lemcke at systbot.uzh.ch

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