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Commons Math example source code file (OneWayAnova.java)
The Commons Math OneWayAnova.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.math.stat.inference; import org.apache.commons.math.MathException; import java.util.Collection; /** * An interface for one-way ANOVA (analysis of variance). * * <p> Tests for differences between two or more categories of univariate data * (for example, the body mass index of accountants, lawyers, doctors and * computer programmers). When two categories are given, this is equivalent to * the {@link org.apache.commons.math.stat.inference.TTest}. * </p> * * @since 1.2 * @version $Revision: 811786 $ $Date: 2009-09-06 05:36:08 -0400 (Sun, 06 Sep 2009) $ */ public interface OneWayAnova { /** * Computes the ANOVA F-value for a collection of <code>double[] * arrays. * * <p>Preconditions:
Collection must contain
* <code>double[] arrays.
* <li> There must be at least two double[] arrays in the
* <code>categoryData collection and each of these arrays must
* contain at least two values.</li>double[]
* arrays each containing data for one category
* @return Fvalue
* @throws IllegalArgumentException if the preconditions are not met
* @throws MathException if the statistic can not be computed do to a
* convergence or other numerical error.
*/
double anovaFValue(Collection<double[]> categoryData)
throws IllegalArgumentException, MathException;
/**
* Computes the ANOVA P-value for a collection of <code>double[]
* arrays.
*
* <p>Preconditions:
Collection must contain
* <code>double[] arrays.
* <li> There must be at least two double[] arrays in the
* <code>categoryData collection and each of these arrays must
* contain at least two values.</li>double[]
* arrays each containing data for one category
* @return Pvalue
* @throws IllegalArgumentException if the preconditions are not met
* @throws MathException if the statistic can not be computed do to a
* convergence or other numerical error.
*/
double anovaPValue(Collection<double[]> categoryData)
throws IllegalArgumentException, MathException;
/**
* Performs an ANOVA test, evaluating the null hypothesis that there
* is no difference among the means of the data categories.
*
* <p>Preconditions:
Collection must contain
* <code>double[] arrays.
* <li> There must be at least two double[] arrays in the
* <code>categoryData collection and each of these arrays must
* contain at least two values.</li>
* <li>alpha must be strictly greater than 0 and less than or equal to 0.5.
* </li>double[]
* arrays each containing data for one category
* @param alpha significance level of the test
* @return true if the null hypothesis can be rejected with
* confidence 1 - alpha
* @throws IllegalArgumentException if the preconditions are not met
* @throws MathException if the statistic can not be computed do to a
* convergence or other numerical error.
*/
boolean anovaTest(Collection<double[]> categoryData, double alpha)
throws IllegalArgumentException, MathException;
}
Other Commons Math examples (source code examples)Here is a short list of links related to this Commons Math OneWayAnova.java source code file: |
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