[R] Classification Analysis

[Huntsinger, Reid]

rpart will calculate the classification rule (represented as a tree) given a
grouped data set. predict.rpart will apply that rule to a single data
element (or data set) for which groupings are not known. path.rpart will
return the rules explicitly, if that's needed. Try the examples from
help("rpart"), help("predict.rpart") and help("path.rpart") to see.

Reid Huntsinger

-----Original Message-----
From: ozric at web.de [mailto:ozric at web.de]
Sent: Wednesday, April 17, 2002 2:23 PM
To: Rishabh Gupta
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] Classification Analysis


Rishabh,
yes your "PseudoCode" idea is what i want in R,too.
But even i mentioned , i didn't know of something like that in R/S-plus and
i have got open eyes for this.

Perhaps anybody in the whole R community work on machineLearning-algorithm 
with rule generating,too ???

So you must program a function for yourself (i.e. C4.5 or FS-ID3) !?

(If you are interesting for papers (pdf) with algorithm let me know).
regards,Christian



Am 17.04.2002 15:13:47, schrieb "Rishabh Gupta" <rg117 at ohm.york.ac.uk>:
>Thanks for your reply.
>I am still learning these aspects of statistical analysis, so if I don't
>make sense please forgive me.
>All this work I am doing is part of a Phd and my deparment does not really
>neural network for situations like these because they say it acts like a
>black box and we don't really know what is happening in the inside. So I
>would like to concentrate on using pure statistical techniques. Ideally
what
>I would like is some kind of a function that calculates the "classification
>rule" when given a grouped data set :
>    rule <- classification( GroupVar ~ DepVar1 + DepVar2 + DepVar3 +
DepVar4
>..... + ...... DepVarX )
>
>Then I would be able to use that rule and apply to a single data element
for
>which the group is not known:
>
>    theGroup <- rule( DataElement )
>
>I have looked at the rpart package in R but I am not entirely sure how to
>use in a way that I can create the "classification rule" and then use that
>rule. I understand that it is a general problem but it's made more
difficult
>for me because I have to deal with 750 dependent variables.
>
>Your help is greatly appreciated.
>
>Many Thanks
>
>Rishabh
>
>----- Original Message -----
>From: "Huntsinger, Reid" <reid_huntsinger at merck.com>
>To: "'Rishabh Gupta'" <rg117 at ohm.york.ac.uk>; <r-help at stat.math.ethz.ch>
>Sent: Tuesday, April 16, 2002 5:00 PM
>Subject: RE: [R] Classification Analysis
>
>
>> This is a very general problem and a very large area of
>statistics/computer
>> science/etc is concerned with it. R provides lots of possibilities; you
>> might find tree-based approaches (recursive partitioning) to suit your
>> needs; in that case, rpart and the new random forests package will be of
>> interest. Also see package e1071 and the VR packages for starters. There
>are
>> lot of other possibilities; you might want to have a look at Ripley,
>Pattern
>> Recognition and Neural Networks, for example, to see some.
>>
>> Reid Huntsinger
>>
>> -----Original Message-----
>> From: Rishabh Gupta [mailto:rg117 at ohm.york.ac.uk]
>> Sent: Tuesday, April 16, 2002 11:14 AM
>> To: r-help at stat.math.ethz.ch
>> Subject: [R] Classification Analysis
>>
>>
>> Hi everyone,
>>     Could somebody explain to me what is the package/function for
>> classification analysis. I am performing analysis of music files in the
>form
>> of MIDI files. I end up with about 750 dependent variables from the
>> analysis, I also have a number of independent/grouping variables that I
>set
>> manually. What I would like is to be able to predict which group a
>> particular MIDI files belongs to given the 750 dependent variables. In
>order
>> to this I have to perform classification analysis on a sample set of MIDI
>> files where I know what group they belong to. I want to extract the
>> 'classification rule' that would enable me to predict the group of each
>MIDI
>> file (there would be a different classification rule for each grouping
>> variable). Can anybody explain what is the best way of doing this in R.
>What
>> is the best package/function that would enable me to perform
>classification
>> analysis.
>>
>> Any help would be greatly appreciated.
>>
>> Many Thanks For Your Help!
>>
>> Rishabh
>>
>>
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