[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.
B.
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.
>>
>>
>> -----
>> The art of living is more like wrestling than dancing.
>> (Marcus Aurelius)
>> --
>> View this message in context:
>> http://www.nabble.com/randomForest-outlier-tp17979182p18466832.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.
>>
> Notice: This e-mail message, together with any attachments, contains
> information of Merck & Co., Inc. (One Merck Drive, Whitehouse Station,
> New Jersey, USA 08889), and/or its affiliates (which may be known
> outside the United States as Merck Frosst, Merck Sharp & Dohme or
> MSD and in Japan, as Banyu - direct contact information for
> affiliates is
> available at http://www.merck.com/contact/contacts.html) that may be
> confidential, proprietary copyrighted and/or legally privileged. It is
> intended solely for the use of the individual or entity named on this
> message. If you are not the intended recipient, and have received this
> message in error, please notify us immediately by reply e-mail and
> then delete it from your system.
>
===========================
Birgit Lemcke
Institut of Systematic Botany
University of Zurich
Zollikerstrasse 107
CH-8008 Zürich
Switzerland
Ph: +41 (0)44 634 8351
mail: birgit.lemcke at systbot.uzh.ch
===========================
More information about the R-help
mailing list