Will it affect if my "nominal" attribute has integer values only,no fractions.Actually,my code is putting data from Lists directly into ARFF file.So,it's a bit tedious to specify the nominal attributes specifically for each dataset.
I am using the NaiveBayes,J48,IBk,MultiPerceptron and SMO classifiers.
Thanks
Gaurav
Peter Reutemann-3 wrote:
> I wanted to know whether the performance of Weka's classifiers is too
> affected if I keep my nominal attributes which has "integer" values as
> numeric only.Is it important to assign these attribute values to "nominal"
> type.
If you don't specify a nominal attribute as such, you might end up
with unwanted results. For instance, how do you interprete a value of
3.4 (a classifier might use this numeric value to split on)? If
fractions of your attribute don't make any sense, leave it as nominal
attribute.
Cheers, Peter
--
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
http://www.cs.waikato.ac.nz/~fracpete/ Ph. +64 (7) 858-5174
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