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List:       wekalist
Subject:    RE: [Wekalist] Model trees: M5
From:       "Castellanos, Malu" <malu () hpl ! hp ! com>
Date:       2003-06-17 20:28:49
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Juan Jose,
Thanks for the response. However, it is inconsistent with page 204 of WEKA book which \
clearly says (at the first line under Nominal Attributes section) that "Before \
constructing a model tree, all nominal attributes are transformed into binary \
variables which are then treated as numeric." Unless M5 handles the transformation by \
itself...??

Thanks

--Malu


-----Original Message-----
From: Juan Jose Rodriguez Diez [mailto:jjrodriguez@ubu.es] 
Sent: Tuesday, June 17, 2003 12:28 AM
To: wekalist@list.scms.waikato.ac.nz
Subject: Re: [Wekalist] Model trees: M5


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M5 handles symbolic attributes. Only the class has to be numeric.

You can try M5P with "cpu.arff". One of the leafs is:


class =

~    -65.3063 *
vendor=honeywell,ipl,ibm,cdc,ncr,basf,gould,siemens,nas,adviser,sperry,amdahl +
~     43.8687 * vendor=adviser,sperry,amdahl +
~    -57.6292 * vendor=amdahl +
~      0.0162 * MMIN +
~      0.0092 * MMAX +
~      0.9105 * CACH +
~     -1.5458 * CHMIN +
~      1.3384 * CHMAX +
~   -118.5033


"vendor" is a symbolic attribute.


Best Regards,



Castellanos, Malu escribió:
> Since model trees like M5 can only handle numeric attributes, does 
> anybody
knows if M5 takes care of transforming all nominal attributes into binary variables \
to treat them as numeric, or does the transformation has to be done apart by using \
the nominalToBinary filter? | In the last case, does anybody has an example of how to \
use this  | filter? Also, does anybody has experimented on the performance of M5 
> for prediction?
> 
> Thanks
> 
> --malu
> 


- --
Juan José Rodriguez, http://pisuerga.inf.ubu.es/juanjo Lenguajes y Sistemas \
Informáticos, Universidad de Burgos

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