javanpst.tests.location.wilcoxonRankSumTest

Class WilcoxonRankSumTest

java.lang.Object

javanpst.tests.StatisticalTest

javanpst.tests.location.wilcoxonRankSumTest.WilcoxonRankSumTest

public class WilcoxonRankSumTest
extends StatisticalTest

The Wilcoxon Ranks-Sum test. This test can be used for testing the null hypothesis of equal medians between two samples, assuming the location model. An exact and a normal approximation of p-values is provided. (exact p-values are only computes if samples' size is equal or lower than 10). Moreover, confidence intervals for the differences of medians (at 0.90 and 0.95 level) are computed. Asymptotic P-value is computed through a normal approximation. Ties are handled by the midranks method, and an appropriate reduction of variance is considered.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	clearData() Clears the data stored in the test
void	doTest() Perform the test
double	getAsymptoticDoublePValue() Get asymptotic double tail p-value
double	getAsymptoticLeftPValue() Get asymptotic left tail p-value
double	getAsymptoticRightPValue() Get asymptotic right tail p-value
double	getExactConfidence90() Get exact confidence of the 0.90 confidence interval
double	getExactConfidence95() Get exact confidence of the 0.95 confidence interval
double	getExactDoublePValue() Get exact double tail p-value
double	getExactLeftPValue() Get exact left tail p-value
double	getExactRightPValue() Get exact right tail p-value
double	getStatistic1() Get Wilcoxon Statistic
java.lang.String	printConfidenceInterval90() Prints the confidence interval for median difference at 0.90 level.
java.lang.String	printConfidenceInterval95() Prints the confidence interval for median difference at 0.95 level.
java.lang.String	printData() Prints the data stored in the test
java.lang.String	printReport() Prints a report with the results of the test
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

WilcoxonRankSumTest

public WilcoxonRankSumTest()

Default builder

WilcoxonRankSumTest

public WilcoxonRankSumTest(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()

Perform the test

Specified by:

doTest in class StatisticalTest

getStatistic1

public double getStatistic1()

Get Wilcoxon Statistic

Returns:

Wilcoxon Statistic

getExactLeftPValue

public double getExactLeftPValue()

Get exact left tail p-value

Returns:

left tail p-value computed

getExactRightPValue

public double getExactRightPValue()

Get exact right tail p-value

Returns:

right tail p-value computed

getExactDoublePValue

public double getExactDoublePValue()

Get exact double tail p-value

Returns:

double tail p-value computed

getAsymptoticLeftPValue

public double getAsymptoticLeftPValue()

Get asymptotic left tail p-value

Returns:

left tail p-value computed

getAsymptoticRightPValue

public double getAsymptoticRightPValue()

Get asymptotic right tail p-value

Returns:

right tail p-value computed

getExactConfidence90

public double getExactConfidence90()

Get exact confidence of the 0.90 confidence interval

Returns:

double tail p-value computed

getExactConfidence95

public double getExactConfidence95()

Get exact confidence of the 0.95 confidence interval

Returns:

double tail p-value computed

printConfidenceInterval90

public java.lang.String printConfidenceInterval90()

Prints the confidence interval for median difference at 0.90 level.

Returns:

Data stored

printConfidenceInterval95

public java.lang.String printConfidenceInterval95()

Prints the confidence interval for median difference at 0.95 level.

Returns:

Data stored

getAsymptoticDoublePValue

public double getAsymptoticDoublePValue()

Get asymptotic double tail p-value

Returns:

double tail p-value computed

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