com.numericalmethod.suanshu.stats.test.rank
Class VanDerWaerden

java.lang.Object
  com.numericalmethod.suanshu.stats.test.HypothesisTest
      com.numericalmethod.suanshu.stats.test.rank.VanDerWaerden

public class VanDerWaerden
extends HypothesisTest

The Van der Waerden test tests for the equality of all population distribution functions. It converts the ranks from a standard Kruskal-Wallis one-way analysis of variance to quantiles of the standard normal distribution. These are called normal scores and the test is computed from these normal scores.

See Also:

Wikipedia: Van der Waerden test

Constructor Summary

VanDerWaerden(double[]... samples)
Perform the Van Der Waerden test to test for the equality of all population distribution functions.

Method Summary

java.lang.String	getAlternativeHypothesis() Get the description of the alternative hypothesis.
java.lang.String	getNullHypothesis() Get a description of the null hypothesis.
double	pValue() Get the p-value for the test statistics.
double	statistics() Get the test statistics.

Methods inherited from class com.numericalmethod.suanshu.stats.test.HypothesisTest

isNullRejected, nGroups, nObs, oneSidedPvalue

Methods inherited from class java.lang.Object

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

Constructor Detail

VanDerWaerden

public VanDerWaerden(double[]... samples)

Perform the Van Der Waerden test to test for the equality of all population distribution functions.

Parameters:

samples - samples

Method Detail

getNullHypothesis

public java.lang.String getNullHypothesis()

Description copied from class: HypothesisTest

Get a description of the null hypothesis.

Specified by:

getNullHypothesis in class HypothesisTest

Returns:

the null hypothesis description

See Also:

Wikipedia: Null hypothesis

getAlternativeHypothesis

public java.lang.String getAlternativeHypothesis()

Description copied from class: HypothesisTest

Get the description of the alternative hypothesis.

Specified by:

getAlternativeHypothesis in class HypothesisTest

Returns:

the alternative hypothesis description

See Also:

Wikipedia: Alternative hypothesis

statistics

public double statistics()

Description copied from class: HypothesisTest

Get the test statistics.

Specified by:

statistics in class HypothesisTest

Returns:

the test statistics

See Also:

Wikipedia: Test statistic

pValue

public double pValue()

Description copied from class: HypothesisTest

Get the p-value for the test statistics.

Specified by:

pValue in class HypothesisTest

Returns:

the p-value

See Also:

Wikipedia: P-value