All Packages  Class Hierarchy  This Package  Previous  Next  Index  WEKA's home

Class weka.classifiers.trees.j48.EntropyBasedSplitCrit 

java.lang.Object
    |
    +----weka.classifiers.trees.j48.SplitCriterion
            |
            +----weka.classifiers.trees.j48.EntropyBasedSplitCrit
public abstract class EntropyBasedSplitCrit
extends SplitCriterion
"Abstract" class for computing splitting criteria based on the entropy of a class distribution.

Version:
$Revision: 1.5 $
Author:
Eibe Frank (eibe@cs.waikato.ac.nz)

Constructor Index

o EntropyBasedSplitCrit()
 

Method Index

o logFunc(double)
Help method for computing entropy.
o newEnt(Distribution)
Computes entropy of distribution after splitting.
o oldEnt(Distribution)
Computes entropy of distribution before splitting.
o splitEnt(Distribution)
Computes entropy after splitting without considering the class values.

Constructor Detail

o EntropyBasedSplitCrit
public EntropyBasedSplitCrit()

Method Detail

o logFunc
public final double logFunc(double num)
          Help method for computing entropy.
o oldEnt
public final double oldEnt(Distribution bags)
          Computes entropy of distribution before splitting.
o newEnt
public final double newEnt(Distribution bags)
          Computes entropy of distribution after splitting.
o splitEnt
public final double splitEnt(Distribution bags)
          Computes entropy after splitting without considering the class values.
All Packages  Class Hierarchy  This Package  Previous  Next  Index  WEKA's home