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Class weka.classifiers.m5.Impurity 

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

Version:
$Revision: 1.2 $
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

Constructors

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

Methods

o toString 
 public final String toString()
Converts an Impurity object to a string

Returns:
the converted string
Overrides:
toString in class 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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