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

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

public class SiegelTukey
extends HypothesisTest

The Siegel-Tukey test 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

Constructor Summary

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

java.lang.String	getAlternativeHypothesis() Get the description of the alternative hypothesis.
java.lang.String	getNullHypothesis() Get a description of the null hypothesis.
double	leftOneSidedPvalue() Get the left, one-sided p-value.
double	pValue() Get the p-value for the test statistics.
double	rightOneSidedPvalue() Get the right, one-sided p-value.
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

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 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

rightOneSidedPvalue

public double rightOneSidedPvalue()

Get the right, one-sided p-value.

Returns:

the right, one-sided p-value.

leftOneSidedPvalue

public double leftOneSidedPvalue()

Get the left, one-sided p-value.

Returns:

the left, one-sided p-value.