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From mdigg...@apache.org
Subject cvs commit: jakarta-commons-sandbox/math/src/test/org/apache/commons/math/stat StatUtilsTest.java
Date Wed, 18 Jun 2003 15:59:55 GMT
mdiggory    2003/06/18 08:59:55

  Added:       math/src/test/org/apache/commons/math/stat
                        StatUtilsTest.java
  Log:
  Initial Deposit for StatUtils unit testing, this was derived from StoreUnivariateImplTest.
  
  Revision  Changes    Path
  1.1                  jakarta-commons-sandbox/math/src/test/org/apache/commons/math/stat/StatUtilsTest.java
  
  Index: StatUtilsTest.java
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  package org.apache.commons.math.stat;
  
  import junit.framework.Test;
  import junit.framework.TestCase;
  import junit.framework.TestSuite;
  
  /**
   * Test cases for the {@link StatUtils} class.
   *
   * @author <a href="mailto:phil@steitz.com">Phil Steitz</a>
   * @author <a href="mailto:mdiggory@apache.org">Mark Diggory</a>
   * @version $Revision: 1.1 $ $Date: 2003/06/18 15:59:55 $
   */
  
  public final class StatUtilsTest extends TestCase {
  
      private double one = 1;
      private float two = 2;
      private int three = 3;
      private double mean = 2;
      private double sumSq = 18;
      private double sum = 8;
      private double var = 0.666666666666666666667;
      private double std = Math.sqrt(var);
      private double n = 4;
      private double min = 1;
      private double max = 3;
      private double skewness = 0;
      private double kurtosis = 0.5;
      private int kClass = StoreUnivariate.LEPTOKURTIC;
      private double tolerance = 10E-15;
  
      public StatUtilsTest(String name) {
          super(name);
      }
  
      public void setUp() {
      }
  
      public static Test suite() {
          TestSuite suite = new TestSuite(StatUtilsTest.class);
          suite.setName("StatUtil Tests");
          return suite;
      }
  
      /** test stats */
      public void testStats() {
          double[] values = new double[] { one, two, two, three };
          assertEquals("sum", sum, StatUtils.sum(values), tolerance);
          assertEquals("sumsq", sumSq, StatUtils.sumSq(values), tolerance);
          assertEquals("var", var, StatUtils.variance(values), tolerance);
          assertEquals(
              "std",
              std,
              StatUtils.standardDeviation(values),
              tolerance);
          assertEquals("mean", mean, StatUtils.mean(values), tolerance);
          assertEquals("min", min, StatUtils.min(values), tolerance);
          assertEquals("max", max, StatUtils.max(values), tolerance);
      }
  
      public void testN0andN1Conditions() throws Exception {
          double[] values = new double[0];
  
          assertTrue(
              "Mean of n = 0 set should be NaN",
              Double.isNaN(StatUtils.mean(values)));
          assertTrue(
              "Standard Deviation of n = 0 set should be NaN",
              Double.isNaN(StatUtils.standardDeviation(values)));
          assertTrue(
              "Variance of n = 0 set should be NaN",
              Double.isNaN(StatUtils.variance(values)));
  
          values = new double[] { one };
  
          assertTrue(
              "Mean of n = 1 set should be value of single item n1",
              StatUtils.mean(values) == one);
          assertTrue(
              "StdDev of n = 1 set should be zero, instead it is: "
                  + StatUtils.standardDeviation(values),
              StatUtils.standardDeviation(values) == 0);
          assertTrue(
              "Variance of n = 1 set should be zero",
              StatUtils.variance(values) == 0);
      }
  
      public void testSkewAndKurtosis() {
  
          double[] values =
              {
                  12.5,
                  12,
                  11.8,
                  14.2,
                  14.9,
                  14.5,
                  21,
                  8.2,
                  10.3,
                  11.3,
                  14.1,
                  9.9,
                  12.2,
                  12,
                  12.1,
                  11,
                  19.8,
                  11,
                  10,
                  8.8,
                  9,
                  12.3 };
  
          assertEquals("mean", 12.40455, StatUtils.mean(values), 0.0001);
          assertEquals("variance", 10.00236, StatUtils.variance(values), 0.0001);
          assertEquals("skewness", 1.437424, StatUtils.skewness(values), 0.0001);
          assertEquals("kurtosis", 2.37719, StatUtils.kurtosis(values), 0.0001);
      }
  
      public void testProductAndGeometricMean() throws Exception {
          double[] values = { 1.0, 2.0, 3.0, 4.0 };
  
          assertEquals(
              "Product not expected",
              24.0,
              StatUtils.product(values),
              Double.MIN_VALUE);
          assertEquals(
              "Geometric mean not expected",
              2.213364,
              StatUtils.geometricMean(values),
              0.00001);
      }
  
  }
  
  

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