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

java.lang.Object
  com.numericalmethod.suanshu.stats.test.HypothesisTest
      com.numericalmethod.suanshu.stats.test.mean.OneWayANOVA

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

Field Summary

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

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

Method Summary

java.lang.String	alternativeHypothesis() Get a description of the alternative hypothesis.
java.lang.String	nullHypothesis() Get a description of the null hypothesis.

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

oneSidedPvalue, pValue, rejectNull, testStatistics

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

nullHypothesis

public java.lang.String nullHypothesis()

Description copied from class: HypothesisTest

Get a description of the null hypothesis.

Specified by:

nullHypothesis in class HypothesisTest

Returns:

the null hypothesis description

See Also:

Wikipedia: Null hypothesis

alternativeHypothesis

public java.lang.String alternativeHypothesis()

Description copied from class: HypothesisTest

Get a description of the alternative hypothesis.

Specified by:

alternativeHypothesis in class HypothesisTest

Returns:

the alternative hypothesis description

See Also:

Wikipedia: Alternative hypothesis