Class MannWhitneyUTest.Result

java.lang.Object

org.apache.commons.statistics.inference.BaseSignificanceResult

org.apache.commons.statistics.inference.MannWhitneyUTest.Result

All Implemented Interfaces:

SignificanceResult

Enclosing class:

MannWhitneyUTest

public static final class MannWhitneyUTest.Result
extends BaseSignificanceResult

Result for the Mann-Whitney U test.

This class is immutable.

Since:

1.1

Field Summary

Fields

Modifier and Type	Field	Description
private final boolean	tiedValues	Flag indicating the data has tied values.

Constructor Summary

Constructors

Constructor	Description
Result(double statistic, boolean tiedValues, double p)	Create an instance.

Method Summary

Modifier and Type	Method	Description
double	getStatistic()	Returns the test statistic.
boolean	hasTiedValues()	Return true if the data had tied values.

Methods inherited from class BaseSignificanceResult

getPValue

Methods inherited from class Object

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

Methods inherited from interface SignificanceResult

reject

Field Details

tiedValues

private final boolean tiedValues

Flag indicating the data has tied values.

Constructor Details

Result

Result(double statistic,
 boolean tiedValues,
 double p)

Create an instance.

Parameters:

statistic - Test statistic.

tiedValues - Flag indicating the data has tied values.

p - Result p-value.

Method Details

getStatistic

public double getStatistic()

Returns the test statistic.

This is the U₁ statistic. Compute the U₂ statistic using the original sample lengths n and m using:

u2 = (long) n * m - u1;

Specified by:

getStatistic in interface SignificanceResult

Overrides:

getStatistic in class BaseSignificanceResult

Returns:

the statistic

hasTiedValues

public boolean hasTiedValues()

Return true if the data had tied values.

Note: The exact computation cannot be used when there are tied values.

Returns:

true if there were tied values