de.viadee.discretizers4j.impl

Class EqualSizeDiscretizer

java.lang.Object

de.viadee.discretizers4j.AbstractDiscretizer

de.viadee.discretizers4j.impl.EqualSizeDiscretizer

All Implemented Interfaces:

Discretizer, Serializable, Function<Serializable,Double>

public class EqualSizeDiscretizer
extends AbstractDiscretizer

Implementation of the PKID and ESD discretization algorithms described by [Yang and Webb 2009]

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
EqualSizeDiscretizer() creates a PercentileMedianDiscretizer which creates intervals, that are the same size as there are number of intervals
EqualSizeDiscretizer(int classSize) creates a PercentileMedianDiscretizer which creates intervals, that are the same size.

Method Summary

Modifier and Type	Method and Description
protected List<DiscretizationTransition>	fitCreateTransitions(Serializable[] values, Double[] labels) creates the DiscretizationTransition of the values.

Methods inherited from class de.viadee.discretizers4j.AbstractDiscretizer

apply, fit, fit, getDiscretizationTransitionsFromCutPoints, getTransitions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface de.viadee.discretizers4j.Discretizer

apply, getTransition

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

EqualSizeDiscretizer

public EqualSizeDiscretizer()

creates a PercentileMedianDiscretizer which creates intervals, that are the same size as there are number of intervals

EqualSizeDiscretizer

public EqualSizeDiscretizer(int classSize)

creates a PercentileMedianDiscretizer which creates intervals, that are the same size. In actual datasets a minimum size of 30 is recommended by [Weiss, 2002]

Parameters:

classSize - size of Intervals to be created. Might be changed slightly if values length is not divisible by it

Method Detail

fitCreateTransitions

protected List<DiscretizationTransition> fitCreateTransitions(Serializable[] values,
                                                              Double[] labels)

creates the DiscretizationTransition of the values. Each transition will have the same size. If no size is given as a parameter in the constructor, a PKID will be created.

Specified by:

fitCreateTransitions in class AbstractDiscretizer

Parameters:

values - the values to be fitted on

labels - the labels. != null, iff supervised

Returns:

list of Transisitions, created by PercentileMedianDiscretizer. All will have the same length.