Package org.apache.commons.statistics.inference

Class MannWhitneyUTest.Result

java.lang.Object

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

All Implemented Interfaces:

SignificanceResult

Enclosing class:

MannWhitneyUTest

public static final class MannWhitneyUTest.Result
extends Object

Result for the Mann-Whitney U test.

This class is immutable.

Since:

1.1

Method Summary

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.statistics.inference.SignificanceResult

reject

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

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

getPValue

public double getPValue()

Description copied from interface: SignificanceResult

Returns the test statistic p-value.

The number returned is the smallest significance level at which one can reject the null hypothesis.

Specified by:

getPValue in interface SignificanceResult

Returns:

the p-value