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Class weka.classifiers.m5.Impurity 

java.lang.Object
    |
    +----weka.classifiers.m5.Impurity
public final class Impurity
extends java.lang.Object
Class for handling the impurity values when spliting the instances

Version:
$Revision: 1.4 $
Author:
Yong Wang (yongwang@cs.waikato.ac.nz)

Constructor Index

o Impurity(int, int, Instances, int)
Constructs an Impurity object containing the impurity values of partitioning the instances using an attribute

Method Index

o incremental(double, int)
Incrementally computes the impurirty values
o toString()
Converts an Impurity object to a string

Constructor Detail

o Impurity
public Impurity(int partition,
                int attribute,
                Instances inst,
                int k)
          Constructs an Impurity object containing the impurity values of partitioning the instances using an attribute
Parameters:
partition - the index of the last instance in the left subset
attribute - the attribute used in partitioning
inst - instances
k - the order of the impurity; =1, the variance; =2, the stardard deviation; =k, the k-th order root of the variance

Method Detail

o toString
public final java.lang.String toString()
          Converts an Impurity object to a string
Returns:
the converted string
Overrides:
toString in class java.lang.Object
o incremental
public final void incremental(double value,
                              int type)
          Incrementally computes the impurirty values
Parameters:
value - the incremental value
type - if type=1, value will be added to the left subset; type=-1, to the right subset; type=0, initializes 
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