string type attribute in arff

[Sana Amanat]

Hi,

 I have to classify "ReutersGrain-train.arff", but when I tried to classify this file from Weka browser,its showed all classifiers as disabled.And in the preprocessing phase it showed "Attribute is neither nominal nor numerical." Although this .arff has these attributes.It created a problem due to "string" data type.

@attribute Text string

@attribute class-att {0,1}

And I filtered it with weka.filters.unsupervised.attribute.Reorder -Rlast,first, and also with StringToWordVector, StringToNominal but could not resolve the problem.

Any suggestion. Thx in advance.

[Peter Reutemann]

String attributes usually have to get preprocessed before classifiers can work with the data. You can use the StringToWordVector filter for this.

Cheers, Peter
--
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
http://www.cms.waikato.ac.nz/~fracpete/          Ph. +64 (7) 858-5174

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[brooke.herbert]

Hi Sana,

Adding to Peter's comment, have you tried this filter with the Filtered Classifier using Bayes, which handles the filtering and classification?

Best wishes, Brooke

[Sana Amanat]

thanks , I tried it using Weka's editor, it worked well. now I want to embed this functionality in my original code of c#, where I am using Weka.dll. Can you suggest me some links of its tutorial?