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From pste...@apache.org
Subject cvs commit: jakarta-commons/math/src/test/org/apache/commons/math/stat/inference TestStatisticTest.java
Date Sun, 11 Apr 2004 20:30:46 GMT
psteitz     2004/04/11 13:30:46

  Added:       math/src/test/org/apache/commons/math/stat/inference
                        TestStatisticTest.java
  Removed:     math/src/test/org/apache/commons/math/stat
                        TestStatisticTest.java
  Log:
  Moved TestStatisticTest to new inference package.
  
  Revision  Changes    Path
  1.1                  jakarta-commons/math/src/test/org/apache/commons/math/stat/inference/TestStatisticTest.java
  
  Index: TestStatisticTest.java
  ===================================================================
  /*
   * Copyright 2003-2004 The Apache Software Foundation.
   * 
   * Licensed 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 junit.framework.Test;
  import junit.framework.TestCase;
  import junit.framework.TestSuite;
  /**
   * Test cases for the TestStatistic class.
   *
   * @version $Revision: 1.1 $ $Date: 2004/04/11 20:30:46 $
   */
  
  public final class TestStatisticTest extends TestCase {
  
      private TestStatisticImpl testStatistic = new TestStatisticImpl();
  
      public TestStatisticTest(String name) {
          super(name);
      }
  
      public void setUp() {
      }
  
      public static Test suite() {
          TestSuite suite = new TestSuite(TestStatisticTest.class);
          suite.setName("TestStatistic Tests");
          return suite;
      }
  
      public void testChiSquare() throws MathException {
          double[] observed = { 11, 24, 69, 96 };
          double[] expected = { 8.2, 25.2, 65.8, 100.8 };
          assertEquals("chi-square statistic", 1.39743495, testStatistic.chiSquare(expected,
observed), 10E-5);
  
          double[] tooShortObs = { 0 };
          double[] tooShortEx = { 1 };
          try {
              testStatistic.chiSquare(tooShortObs, tooShortEx);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
  
          try {
              testStatistic.chiSquareTest(tooShortObs, tooShortEx);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }  
  
          double[] unMatchedObs = { 0, 1, 2, 3 };
          double[] unMatchedEx = { 1, 1, 2 };
          try {
              testStatistic.chiSquare(unMatchedEx, unMatchedObs);
              fail("arrays have different lengths, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
          expected[0] = 0;
          try {
              testStatistic.chiSquareTest(expected, observed, .01);
              fail("bad expected count, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }  
          
          /** from http://www.vsenvirginia.org/stat/classpractice/Voter_Preferences_CP.pdf
*/
          double[] observed1 = { 504, 523, 72, 70, 31 };
          double[] expected1 = { 480, 540, 84, 60, 36 };
          assertEquals( "chi-square test statistic", 5.81, testStatistic.chiSquare(expected1,
observed1), 10E-2);
          assertEquals("chi-square p-value", 0.21, testStatistic.chiSquareTest(expected1,
observed1), 10E-2);
          assertTrue("chi-square test reject", testStatistic.chiSquareTest(expected1, observed1,
0.3));
          assertTrue("chi-square test accept", !testStatistic.chiSquareTest(expected1, observed1,
0.1));
  
          try {
              testStatistic.chiSquareTest(expected1, observed1, 95);
              fail("alpha out of range, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
      }
  
      public void testT() throws Exception {
          double[] observed =
              {93.0, 103.0, 95.0, 101.0, 91.0, 105.0, 96.0, 94.0, 101.0,  88.0, 98.0, 94.0,
101.0, 92.0, 95.0 };
          double mu = 100.0;
          SummaryStatistics sampleStats = null;
          sampleStats = SummaryStatistics.newInstance();
          for (int i = 0; i < observed.length; i++) {
              sampleStats.addValue(observed[i]);
          }
  
          assertEquals("t statistic", -2.82, testStatistic.t(mu, observed), 10E-3);
          assertEquals("t statistic", -2.82, testStatistic.t(mu, sampleStats), 10E-3);
  
          double[] nullObserved = null;
          try {
              testStatistic.t(mu, nullObserved);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
  
          SummaryStatistics nullStats = null;   
          try {
              testStatistic.t(mu, nullStats);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
  
          double[] emptyObs = {};
          try {
              testStatistic.t(mu, emptyObs);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
  
          SummaryStatistics emptyStats =SummaryStatistics.newInstance();   
          try {
              testStatistic.t(mu, emptyStats);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
  
          double[] tooShortObs = { 1.0 };
          try {
              testStatistic.t(mu, tooShortObs);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // exptected
          }
          try {
              testStatistic.tTest(mu, tooShortObs);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
             // expected
          }  
  
          SummaryStatistics tooShortStats = SummaryStatistics.newInstance();     
          tooShortStats.addValue(0d);
          tooShortStats.addValue(2d);
          try {
              testStatistic.t(mu, tooShortStats);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // exptected
          }
          try {
              testStatistic.tTest(mu, tooShortStats);
              fail("arguments too short, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // exptected
          }  
  
          /** Moore and McCabe Example 8.3, p 516 */
          double[] oneSidedP =
              {2d, 0d, 6d, 6d, 3d, 3d, 2d, 3d, -6d, 6d, 6d, 6d, 3d, 0d, 1d, 1d, 0d, 2d, 3d,
3d };
          SummaryStatistics oneSidedPStats = SummaryStatistics.newInstance();    
          for (int i = 0; i < oneSidedP.length; i++) {
              oneSidedPStats.addValue(oneSidedP[i]);
          }
          assertEquals("one sample t stat", 3.86, testStatistic.t(0d, oneSidedP), 0.01);
          assertEquals("one sample t stat", 3.86, testStatistic.t(0d, oneSidedPStats), 0.01);
          assertEquals("one sample p value", 0.00052, testStatistic.tTest(0d, oneSidedP) /
2d, 10E-5);
          assertEquals("one sample p value", 0.00052, testStatistic.tTest(0d, oneSidedPStats)
/ 2d, 10E-5);
          assertTrue("one sample t-test reject", testStatistic.tTest(0d, oneSidedP, 0.01));
          assertTrue("one sample t-test reject", testStatistic.tTest(0d, oneSidedPStats, 0.01));
          assertTrue("one sample t-test accept", !testStatistic.tTest(0d, oneSidedP, 0.0001));
          assertTrue("one sample t-test accept", !testStatistic.tTest(0d, oneSidedPStats,
0.0001));
           
          try {
              testStatistic.tTest(0d, oneSidedP, 95);
              fail("alpha out of range, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // exptected
          }  
          
          try {
              testStatistic.tTest(0d, oneSidedPStats, 95);
              fail("alpha out of range, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }  
  
          /** Moore and McCabe Example 8.12, p 552 */
          double[] sample1 = { 7d, -4d, 18d, 17d, -3d, -5d, 1d, 10d, 11d, -2d };
          double[] sample2 = { -1d, 12d, -1d, -3d, 3d, -5d, 5d, 2d, -11d, -1d, -3d };
          SummaryStatistics sampleStats1 = SummaryStatistics.newInstance();  
          for (int i = 0; i < sample1.length; i++) {
              sampleStats1.addValue(sample1[i]);
          }
          SummaryStatistics sampleStats2 = SummaryStatistics.newInstance();    
          for (int i = 0; i < sample2.length; i++) {
              sampleStats2.addValue(sample2[i]);
          }
           
          // Target comparison values computed using R version 1.8.1 (Linux version)
          assertEquals("two sample t stat", 1.6037, testStatistic.t(sample1, sample2), 10E-4);
          assertEquals("two sample t stat", 1.6037, testStatistic.t(sampleStats1, sampleStats2),
10E-4);
          assertEquals("two sample p value", 0.0644, testStatistic.tTest(sample1, sample2)
/ 2d, 10E-4);
          assertEquals("two sample p value", 0.0644, testStatistic.tTest(sampleStats1, sampleStats2)
/ 2d, 10E-4);
          
          assertTrue("two sample t-test reject", testStatistic.tTest(sample1, sample2, 0.2));
          assertTrue("two sample t-test reject", testStatistic.tTest(sampleStats1, sampleStats2,
0.2));
          assertTrue("two sample t-test accept", !testStatistic.tTest(sample1, sample2, 0.1));
          assertTrue("two sample t-test accept", !testStatistic.tTest(sampleStats1, sampleStats2,
0.1));
       
          try {
              testStatistic.tTest(sample1, sample2, 95);
              fail("alpha out of range, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // exptected
          } 
          
          try {
              testStatistic.tTest(sampleStats1, sampleStats2, 95);
              fail("alpha out of range, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected 
          }  
          
          try {
              testStatistic.tTest(sample1, tooShortObs, .01);
              fail("insufficient data, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }  
          
          try {
              testStatistic.tTest(sampleStats1, tooShortStats, .01);
              fail("insufficient data, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }  
          
          try {
              testStatistic.tTest(sample1, tooShortObs);
              fail("insufficient data, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
             // expected
          }  
          
          try {
              testStatistic.tTest(sampleStats1, tooShortStats);
              fail("insufficient data, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }  
          
          try {
              testStatistic.t(sample1, tooShortObs);
              fail("insufficient data, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
              // expected
          }
          
          try {
              testStatistic.t(sampleStats1, tooShortStats);
              fail("insufficient data, IllegalArgumentException expected");
          } catch (IllegalArgumentException ex) {
             // expected
          }
      }
  }
  
  
  

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