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From pste...@apache.org
Subject cvs commit: jakarta-commons/math/src/test/org/apache/commons/math/stat/inference TTestTest.java
Date Sun, 23 May 2004 05:06:20 GMT
psteitz     2004/05/22 22:06:20

  Modified:    math/src/test/org/apache/commons/math/stat/inference
                        TTestTest.java
  Log:
  Added test case for small samples, adjusted for PR #29050 changes.
  
  Revision  Changes    Path
  1.2       +13 -6     jakarta-commons/math/src/test/org/apache/commons/math/stat/inference/TTestTest.java
  
  Index: TTestTest.java
  ===================================================================
  RCS file: /home/cvs/jakarta-commons/math/src/test/org/apache/commons/math/stat/inference/TTestTest.java,v
  retrieving revision 1.1
  retrieving revision 1.2
  diff -u -r1.1 -r1.2
  --- TTestTest.java	3 May 2004 03:04:54 -0000	1.1
  +++ TTestTest.java	23 May 2004 05:06:20 -0000	1.2
  @@ -91,29 +91,28 @@
           double[] tooShortObs = { 1.0 };
           try {
               testStatistic.t(mu, tooShortObs);
  -            fail("arguments too short, IllegalArgumentException expected");
  +            fail("insufficient data to compute t statistic, IllegalArgumentException expected");
           } catch (IllegalArgumentException ex) {
               // exptected
           }
           try {
               testStatistic.tTest(mu, tooShortObs);
  -            fail("arguments too short, IllegalArgumentException expected");
  +            fail("insufficient data to perform t test, 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");
  +            fail("insufficient data to compute t statistic, IllegalArgumentException expected");
           } catch (IllegalArgumentException ex) {
               // exptected
           }
           try {
               testStatistic.tTest(mu, tooShortStats);
  -            fail("arguments too short, IllegalArgumentException expected");
  +            fail("insufficient data to perform t test, IllegalArgumentException expected");
           } catch (IllegalArgumentException ex) {
               // exptected
           }  
  @@ -224,5 +223,13 @@
           } catch (IllegalArgumentException ex) {
              // expected
           }
  +    }
  +    
  +    public void testSmallSamples() throws Exception {
  +        double[] sample1 = {1d, 3d};
  +        double[] sample2 = {4d, 5d};        
  +        // Target values computed using R, version 1.8.1 (linux version)
  +        assertEquals(-2.2361, testStatistic.t(sample1, sample2), 1E-4);
  +        assertEquals(0.1987, testStatistic.tTest(sample1, sample2), 1E-4);
       }
   }
  
  
  

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