org.statcato.statistics.inferential

Class ContingencyTable

java.lang.Object

org.statcato.statistics.inferential.ContingencyTable

public class ContingencyTable
extends java.lang.Object

A contingency table. Provides methods that perform computations relevant to a test of independence in a contingency table.

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
ContingencyTable(java.util.Vector<java.util.Vector<java.lang.Double>> table) Constructor.

Method Summary

Modifier and Type	Method and Description
double	criticalValue(double confidenceLevel) Returns the critical value corresponding to the given confidence level and degrees of freedom of the contingency table.
int	DOF() Returns the degrees of freedom of a contingency table.
double	pValue() Returns the p-Value corresponding to the test statistic in a chi-square distribution.
double	testStatistics() Returns the test statistic for a test of independence between the row and column variable in the contingency table.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ContingencyTable

public ContingencyTable(java.util.Vector<java.util.Vector<java.lang.Double>> table)

Constructor. A vector of vector of Double representing the table of observed frequencies is provided. The row and column totals are calculated. The expected frequencies are also computed.

Parameters:

table - vector of vector of Double representing the table of observed frequencies

Method Detail

testStatistics

public double testStatistics()

Returns the test statistic for a test of independence between the row and column variable in the contingency table. chi^2 = Sum((O-E)^2 / E).

Returns:

chi^2 test statistics

DOF

public int DOF()

Returns the degrees of freedom of a contingency table.

Returns:

degrees of freedom

criticalValue

public double criticalValue(double confidenceLevel)

Returns the critical value corresponding to the given confidence level and degrees of freedom of the contingency table.

Returns:

critical value

pValue

public double pValue()

Returns the p-Value corresponding to the test statistic in a chi-square distribution.

Returns:

p-value

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object