javanpst.tests.scale.freund_Ansari_BradleyTest

Class Freund_Ansari_BradleyTest

java.lang.Object

javanpst.tests.StatisticalTest

javanpst.tests.scale.freund_Ansari_BradleyTest.Freund_Ansari_BradleyTest

public class Freund_Ansari_BradleyTest
extends StatisticalTest

The Freund-Ansari-Bradley test. Assuming the scale model (equal medians), this test can be employed to test whether the two distributions selected have equal scale parameter (with the null hypothesis of equality). The Freund-Ansari-Bradley test ranks elements with the following weights: 1,2,3 ... N/2 ... 3,2,1 for N even 1,2,3 ... (N+1/2) ... 3,2,1 for N odd An approximation to the Normal distribution is employed to compute p-values.

Constructor Summary

Constructors

Constructor and Description
Freund_Ansari_BradleyTest() Default builder
Freund_Ansari_BradleyTest(DataTable newData) Builder.

Method Summary

Modifier and Type	Method and Description
void	clearData() Clears the data stored in the test
void	doTest() Performs the test
double	getDoublePValue() Get double tail p-value
double	getLeftPValue() Get left tail p-value
double	getRightPValue() Get right tail p-value
double	getTestStatistic1() Get test statistic associated to the first sample
double	getTestStatistic2() Get test statistic associated to the second sample
java.lang.String	printData() Prints the data stored in the test
java.lang.String	printReport() Prints a report with the results of the test
java.lang.String	printWeights() Prints the array of weights
void	setData(DataTable newData) Sets data to test

Methods inherited from class javanpst.tests.StatisticalTest

isDataReady, isPerformed

Methods inherited from class java.lang.Object

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

Constructor Detail

Freund_Ansari_BradleyTest

public Freund_Ansari_BradleyTest()

Default builder

Freund_Ansari_BradleyTest

public Freund_Ansari_BradleyTest(DataTable newData)

Builder. Load data to test.

Parameters:

newData - data to test.

Method Detail

clearData

public void clearData()

Clears the data stored in the test

Specified by:

clearData in class StatisticalTest

setData

public void setData(DataTable newData)

Sets data to test

Parameters:

newData - data to test.

doTest

public void doTest()

Performs the test

Specified by:

doTest in class StatisticalTest

getTestStatistic1

public double getTestStatistic1()

Get test statistic associated to the first sample

Returns:

normal Statistic of the first sample

getTestStatistic2

public double getTestStatistic2()

Get test statistic associated to the second sample

Returns:

normal Statistic of the second sample

getLeftPValue

public double getLeftPValue()

Get left tail p-value

Returns:

left tail p-value computed

getRightPValue

public double getRightPValue()

Get right tail p-value

Returns:

right tail p-value computed

getDoublePValue

public double getDoublePValue()

Get double tail p-value

Returns:

double tail p-value computed

printWeights

public java.lang.String printWeights()

Prints the array of weights

Returns:

string with the contents of the array

printData

public java.lang.String printData()

Prints the data stored in the test

Specified by:

printData in class StatisticalTest

Returns:

Data stored

printReport

public java.lang.String printReport()

Prints a report with the results of the test

Specified by:

printReport in class StatisticalTest

Returns:

Output report