jbnc.measures
Class QualityMeasureSB

java.lang.Object
  jbnc.measures.QualityMeasure
      jbnc.measures.QualityMeasureSB

public class QualityMeasureSB

extends QualityMeasure

Measure the quality of the bayesian network on the dataset using asymptotic estimate of the standard bayes measure.

q = sum_{i =1...n} sum _{j =0...ri} sum_{k =1...si} N_ijk log N_ijk / N _ij - 1/2 Dim (B ) log N

where N_ijk means that variable X_i is in configuration j and parents of variable X_i are in configuration k , Dim (B ) is the dimension of the network, N is the number of cases in the training data set.

E. Castillo, J. M. Gutierrez and A. S. Hadi, Expert Systems and Probabilistic Network Models , Springer, 1997. p.494, eq.(11.28).

Since:

June 1, 1999

Author:

Jarek Sacha

Field Summary

Fields inherited from class jbnc.measures.QualityMeasure

alphaK, dataset, usePriors

Constructor Summary

QualityMeasureSB()
Constructor for the QualityMeasureSB object

QualityMeasureSB(DatasetInt dataset)
Constructor for the QualityMeasureSB object

Method Summary

double	evaluate(BayesianNetworks.BayesNet net) Description of the Method
java.lang.String	getName() Gets the Name attribute of the QualityMeasureSB object

Methods inherited from class jbnc.measures.QualityMeasure

getAlphaK, getUsePriors, setAlphaK, setDataset, setUsePriors

Methods inherited from class java.lang.Object

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

Constructor Detail

QualityMeasureSB

public QualityMeasureSB()

Constructor for the QualityMeasureSB object

QualityMeasureSB

public QualityMeasureSB(DatasetInt dataset)

Constructor for the QualityMeasureSB object

Parameters:

dataset - Description of Parameter

Method Detail

getName

public java.lang.String getName()

Gets the Name attribute of the QualityMeasureSB object

Specified by:

getName in class QualityMeasure

Returns:

The Name value

evaluate

public final double evaluate(BayesianNetworks.BayesNet net)
                      throws java.lang.Exception

Description of the Method

Specified by:

evaluate in class QualityMeasure

Parameters:

net - Description of Parameter

Returns:

Description of the Returned Value

Throws:

java.lang.Exception - Description of Exception