Using Filters

• Filters can be used to change data files, e.g.

  • delete first and second attributes
    java weka.filters.AttributeFilter –R 1,2 –i iris.arff –o iris.new.arff

• AttributeSelectionFilter lets you select a set of attributes using classes in the weka.attributeSelection package

  java weka.filters.AttributeSelectionFilter –E weka.attributeSelection.InfoGainAttributeEval –i weather.arff
  

• Other filters

  DiscretizeFilter Discretizes a range of numeric attributes in the dataset into nominal attributes
  
  NominalToBinaryFilter Converts nominal attributes into binary ones, replacing each attribute with k values with k-1 new binary attributes
  NumericTransformFilter Transforms numeric attributes using given method
  (java weka.filters. NumericTransformFilter –C java.lang.Math –M sqrt … )

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