com.numericalmethod.suanshu.stats.test.rank

Class SiegelTukey

java.lang.Object

com.numericalmethod.suanshu.stats.test.HypothesisTest

com.numericalmethod.suanshu.stats.test.rank.SiegelTukey

All Implemented Interfaces:

java.io.Serializable

public class SiegelTukey
extends HypothesisTest

Siegel–Tukey tests for differences in scale (variability) between two groups.

The test is used to determine if one of two groups of data tends to have more widely dispersed values than the other. In other words, the test determines whether one of the two groups tends to move, sometimes to the right, sometimes to the left, but away from the center (of the ordinal scale).

See Also:

Wikipedia: iegel–Tukey test, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
double	pValue1SidedGreater right, one-sided p-value
double	pValue1SidedLess left, one-sided p-value

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

k, N, pValue, testStatistics

Constructor Summary

Constructors

Constructor and Description
SiegelTukey(double[] sample1, double[] sample2) Perform the Siegel-Tukey test to test for differences in scale (variability) between two groups.
SiegelTukey(double[] sample1, double[] sample2, double mu) Perform the Siegel-Tukey test to test for differences in scale (variability) between two groups.
SiegelTukey(double[] sample1, double[] sample2, double mu, boolean isExact) Perform the Siegel-Tukey test to test for differences in scale (variability) between two groups.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getAlternativeHypothesis() Get a description of the alternative hypothesis.
java.lang.String	getNullHypothesis() Get a description of the null hypothesis.

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

isNullRejected, oneSidedPvalue, pValue, statistics

Methods inherited from class java.lang.Object

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

Field Detail

pValue1SidedLess

public final double pValue1SidedLess

left, one-sided p-value

pValue1SidedGreater

public final double pValue1SidedGreater

right, one-sided p-value

Constructor Detail

SiegelTukey

public SiegelTukey(double[] sample1,
                   double[] sample2,
                   double mu,
                   boolean isExact)

Perform the Siegel-Tukey test to test for differences in scale (variability) between two groups.

Parameters:

sample1 - sample 1

sample2 - sample 2

mu - the hypothetical mean difference

isExact - indicate whether the exact Wilcoxon Rank Sum distribution is used

SiegelTukey

public SiegelTukey(double[] sample1,
                   double[] sample2,
                   double mu)

Perform the Siegel-Tukey test to test for differences in scale (variability) between two groups.

Parameters:

sample1 - sample 1

sample2 - sample 2

mu - the hypothetical mean difference

SiegelTukey

public SiegelTukey(double[] sample1,
                   double[] sample2)

Perform the Siegel-Tukey test to test for differences in scale (variability) between two groups.

Parameters:

sample1 - sample 1

sample2 - sample 2

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 a description of the alternative hypothesis.

Specified by:

getAlternativeHypothesis in class HypothesisTest

Returns:

the alternative hypothesis description

See Also:

Wikipedia: Alternative hypothesis