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List:       wekalist
Subject:    Re: [Wekalist] Multiclassification question
From:       Peter Reutemann <fracpete () waikato ! ac ! nz>
Date:       2006-04-30 21:52:37
Message-ID: 445531A5.2030106 () waikato ! ac ! nz
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> Would there be a way to have Weka predict classes, based on the feature 
> set given on the left? I understand that multiclass regression would 
> work if there are more than 2 classes - so for a "Class" column at the 
> end, I wouldn't be limited to Class 1 or 2, but could have as many as I 
> desired.
> 
> But, those would work only if the data was classified into *one* of the 
> given classes. In this case however, each row can have more than one 
> class simultaneously. Could anyone shed some light on this?

In Weka, you can only have one class attribute. This is what a colleague 
of mine suggested:
"In Weka, you need to split the data into many two-class datasets in 
this case, in each case learning a particular class against all the 
other classes."

HTH

Cheers, Peter
-- 
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
http://www.cs.waikato.ac.nz/~fracpete/     +64 (7) 838-4466 Ext. 5174

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