jbnc.util
Class FrequencyCalc

java.lang.Object
  jbnc.util.FrequencyCalc

public class FrequencyCalc

extends java.lang.Object

Calculate variable frequencies given a dataset.

Since:

June 1, 1999

Author:

Jarek Sacha

Field Summary

protected Dataset	dataset
protected int[][]	freqX Frequency of variable values X.
protected int[][][][]	freqXY Joint frequency of variable values X and Y.
protected int[][][][][]	freqXYZ Joint frequency of variable values X, Y and Z.
AttributeSpecs[]	names Specs for variables in the dataset from which the frequecies were calculated.
int	nbCases Number of cases in the dataset the dataset.

Constructor Summary

FrequencyCalc(DatasetInt dataset)
Constructor for the FrequencyCalc object

Method Summary

protected void	calcFreqXY_X() Calculate values of freqX and freqXY.
protected void	calcFreqXYZ() Calculate values of freqXYZ
protected void	init(Dataset dataset)

Methods inherited from class java.lang.Object

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

Field Detail

nbCases

public int nbCases

Number of cases in the dataset the dataset.

names

public AttributeSpecs[] names

Specs for variables in the dataset from which the frequecies were calculated.

freqXYZ

protected int[][][][][] freqXYZ

Joint frequency of variable values X, Y and Z. X corresponds any attribute with index [0,nbAttrib-1]. Y corresponds any attribute with index [0,nbAttrib-1]. Index of X is always less or iqual to Y, since relation is symetric. Z is the last variable, so its index is implicit (equal to nbAttrib).

Note that elements on the diagonal are used only for calculation of p(x,z), they are not used guring computation of p(x,y,z).

 freqXYZ[index_x][index_y][state_x][state_y][state_z]
 

freqXY

protected int[][][][] freqXY

Joint frequency of variable values X and Y. X corresponds variable with index [0,nbAttrib]. Y corresponds variable with index [0,nbAttrib].

 freqXY[index_x][index_y][state_x][state_y]
 

freqX

protected int[][] freqX

Frequency of variable values X. X corresponds any variable, with index [0,nbAttrib].

 freqX[index_x][state_x]
 

dataset

protected Dataset dataset

Constructor Detail

FrequencyCalc

public FrequencyCalc(DatasetInt dataset)

Constructor for the FrequencyCalc object

Parameters:

dataset - Description of Parameter

Method Detail

init

protected void init(Dataset dataset)

Parameters:

dataset - Description of Parameter

calcFreqXYZ

protected void calcFreqXYZ()

Calculate values of freqXYZ

calcFreqXY_X

protected void calcFreqXY_X()

Calculate values of freqX and freqXY.