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Class weka.classifiers.j48.GainRatioSplitCrit 

java.lang.Object
   |
   +----weka.classifiers.j48.SplitCriterion
           |
           +----weka.classifiers.j48.EntropyBasedSplitCrit
                   |
                   +----weka.classifiers.j48.GainRatioSplitCrit
public final class GainRatioSplitCrit
extends EntropyBasedSplitCrit
Class for computing the gain ratio for a given distribution.

Version:
$Revision: 1.2 $
Author:
Eibe Frank (eibe@cs.waikato.ac.nz)

Constructor Index

o GainRatioSplitCrit()

Method Index

o splitCritValue(Distribution)
This method is a straightforward implementation of the gain ratio criterion for the given distribution.
o splitCritValue(Distribution, double, double)
This method computes the gain ratio in the same way C4.5 does.

Constructors

o GainRatioSplitCrit 
 public GainRatioSplitCrit()

Methods

o splitCritValue 
 public final double splitCritValue(Distribution bags)
This method is a straightforward implementation of the gain ratio criterion for the given distribution.

Overrides:
splitCritValue in class SplitCriterion
o splitCritValue 
 public final double splitCritValue(Distribution bags,
                                    double totalnoInst,
                                    double numerator)
This method computes the gain ratio in the same way C4.5 does.

Parameters:
bags - the distribution
totalnoInst - the weight of ALL instances
numerator - the info gain 
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