SuanShu, a Java numerical and statistical library



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

java.lang.Object
  extended by com.numericalmethod.suanshu.stats.test.HypothesisTest
      extended by 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
 String getAlternativeHypothesis()
          Get the description of the alternative hypothesis.
 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 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 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


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