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An instance filter that discretizes a range of numeric attributes in the dataset into nominal attributes. Discretization is by Fayyad & Irani's MDL method (the default).

For more information, see:

Usama M. Fayyad, Keki B. Irani: Multi-interval discretization of continuousvalued attributes for classification learning. In: Thirteenth International Joint Conference on Articial Intelligence, 1022-1027, 1993.

Igor Kononenko: On Biases in Estimating Multi-Valued Attributes. In: 14th International Joint Conference on Articial Intelligence, 1034-1040, 1995.


The table below describes the options available for Discretize.

Option Description
attributeIndices Specify range of attributes to act on. This is a comma separated list of attribute indices, with "first" and "last" valid values. Specify an inclusive range with "-". E.g: "first-3,5,6-10,last".
invertSelection Set attribute selection mode. If false, only selected (numeric) attributes in the range will be discretized; if true, only non-selected attributes will be discretized.
makeBinary Make resulting attributes binary.
useBetterEncoding Uses a more efficient split point encoding.
useKononenko Use Kononenko's MDL criterion. If set to false uses the Fayyad & Irani criterion.


The table below describes the capabilites of Discretize.

Capability Supported
Class Nominal class, Binary class
Attributes Empty nominal attributes, String attributes, Date attributes, Nominal attributes, Numeric attributes, Binary attributes, Relational attributes, Missing values, Unary attributes
Min # of instances 0

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