com.numericalmethod.suanshu.stats.test.mean

Class OneWayANOVA

java.lang.Object

com.numericalmethod.suanshu.stats.test.HypothesisTest

com.numericalmethod.suanshu.stats.test.mean.OneWayANOVA

All Implemented Interfaces:

java.io.Serializable

public class OneWayANOVA
extends HypothesisTest

The One-Way ANOVA test tests for the equality of the means of several groups.

ANOVAs are helpful because they possess an advantage over a two-sample t-test. Doing multiple two-sample t-tests would result in an increased chance of committing a type I error. For this reason, ANOVAs are useful in comparing three or more means.

The R equivalent function is aov.

See Also:

• Wikipedia: ANOVA
• Wikipedia: The FDistribution-test
• Wikipedia: FDistribution-test

, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
int	df1 degree of freedoms
int	df2 degree of freedoms

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

k, N, pValue, testStatistics

Constructor Summary

Constructors

Constructor and Description
OneWayANOVA(double[]... samples) Perform the one-way ANOVA test to test for the equality of the means of several 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

df1

public final int df1

degree of freedoms

df2

public final int df2

degree of freedoms

Constructor Detail

OneWayANOVA

public OneWayANOVA(double[]... samples)

Perform the one-way ANOVA test to test for the equality of the means of several groups.

Parameters:

samples - the 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 a description of the alternative hypothesis.

Specified by:

getAlternativeHypothesis in class HypothesisTest

Returns:

the alternative hypothesis description

See Also:

Wikipedia: Alternative hypothesis