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Commons Math example source code file (OneWayAnovaTest.java)

This example Commons Math source code file (OneWayAnovaTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

anova, anova, arraylist, arraylist, exception, f-value, illegalargumentexception, illegalargumentexception, list, list, onewayanovatest, p-value, test, testcase, util

The Commons Math OneWayAnovaTest.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 java.util.ArrayList;
import java.util.List;

import junit.framework.TestCase;

/**
 * Test cases for the OneWayAnovaImpl class.
 *
 * @version $Revision: 902201 $ $Date: 2010-01-22 13:18:16 -0500 (Fri, 22 Jan 2010) $
 */

public class OneWayAnovaTest extends TestCase {

    protected OneWayAnova testStatistic = new OneWayAnovaImpl();

    private double[] emptyArray = {};

    private double[] classA =
            {93.0, 103.0, 95.0, 101.0, 91.0, 105.0, 96.0, 94.0, 101.0 };
    private double[] classB =
            {99.0, 92.0, 102.0, 100.0, 102.0, 89.0 };
    private double[] classC =
            {110.0, 115.0, 111.0, 117.0, 128.0, 117.0 };

    public OneWayAnovaTest(String name) {
        super(name);
    }

    public void testAnovaFValue() throws Exception {
        // Target comparison values computed using R version 2.6.0 (Linux version)
        List<double[]> threeClasses = new ArrayList();
        threeClasses.add(classA);
        threeClasses.add(classB);
        threeClasses.add(classC);

        assertEquals("ANOVA F-value",  24.67361709460624,
                 testStatistic.anovaFValue(threeClasses), 1E-12);

        List<double[]> twoClasses = new ArrayList();
        twoClasses.add(classA);
        twoClasses.add(classB);

        assertEquals("ANOVA F-value",  0.0150579150579,
                 testStatistic.anovaFValue(twoClasses), 1E-12);

        List<double[]> emptyContents = new ArrayList();
        emptyContents.add(emptyArray);
        emptyContents.add(classC);
        try {
            testStatistic.anovaFValue(emptyContents);
            fail("empty array for key classX, IllegalArgumentException expected");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        List<double[]> tooFew = new ArrayList();
        tooFew.add(classA);
        try {
            testStatistic.anovaFValue(tooFew);
            fail("less than two classes, IllegalArgumentException expected");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }


    public void testAnovaPValue() throws Exception {
        // Target comparison values computed using R version 2.6.0 (Linux version)
        List<double[]> threeClasses = new ArrayList();
        threeClasses.add(classA);
        threeClasses.add(classB);
        threeClasses.add(classC);

        assertEquals("ANOVA P-value", 6.959446E-06,
                 testStatistic.anovaPValue(threeClasses), 1E-12);

        List<double[]> twoClasses = new ArrayList();
        twoClasses.add(classA);
        twoClasses.add(classB);

        assertEquals("ANOVA P-value",  0.904212960464,
                 testStatistic.anovaPValue(twoClasses), 1E-12);

    }

    public void testAnovaTest() throws Exception {
        // Target comparison values computed using R version 2.3.1 (Linux version)
        List<double[]> threeClasses = new ArrayList();
        threeClasses.add(classA);
        threeClasses.add(classB);
        threeClasses.add(classC);

        assertTrue("ANOVA Test P<0.01", testStatistic.anovaTest(threeClasses, 0.01));

        List<double[]> twoClasses = new ArrayList();
        twoClasses.add(classA);
        twoClasses.add(classB);

        assertFalse("ANOVA Test P>0.01", testStatistic.anovaTest(twoClasses, 0.01));
    }

}

Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math OneWayAnovaTest.java source code file:

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