Package dev.nm.stat.test.variance
Class BrownForsythe
- java.lang.Object
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- dev.nm.stat.test.HypothesisTest
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- dev.nm.stat.test.variance.BrownForsythe
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public class BrownForsythe extends HypothesisTest
The Brown-Forsythe test is a statistical test for the equality of group variances based on performing an ANOVA on a transformation of the response variable. In statistics, when a usual one-way ANOVA is performed, it is assumed that the group variances are statistically equal. If this assumption is not valid, then the resulting F-test is invalid. A homoscedasticity test, such as the Brown-Forsythe test, can be used to verify that assumption.- See Also:
- Wikipedia: Brown-Forsythe Test
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Constructor Summary
Constructors Constructor Description BrownForsythe(double[]... samples)
Perform the Brown-Forsythe test to test for equal variances across the groups.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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 dev.nm.stat.test.HypothesisTest
isNullRejected, nGroups, nObs, oneSidedPvalue
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Method Detail
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getNullHypothesis
public String getNullHypothesis()
Description copied from class:HypothesisTest
Get a description of the null hypothesis.- Specified by:
getNullHypothesis
in classHypothesisTest
- Returns:
- the null hypothesis description
- See Also:
- Wikipedia: Null hypothesis
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getAlternativeHypothesis
public String getAlternativeHypothesis()
Description copied from class:HypothesisTest
Get the description of the alternative hypothesis.- Specified by:
getAlternativeHypothesis
in classHypothesisTest
- Returns:
- the alternative hypothesis description
- See Also:
- Wikipedia: Alternative hypothesis
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statistics
public double statistics()
Description copied from class:HypothesisTest
Get the test statistics.- Specified by:
statistics
in classHypothesisTest
- Returns:
- the test statistics
- See Also:
- Wikipedia: Test statistic
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pValue
public double pValue()
Description copied from class:HypothesisTest
Get the p-value for the test statistics.- Specified by:
pValue
in classHypothesisTest
- Returns:
- the p-value
- See Also:
- Wikipedia: P-value
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