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Replaced low-accuracy textbook comparison values with values from R. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141126 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-03-07 21:55:18 +00:00
parent bd460b62fb
commit e9c7ed28a6
1 changed files with 8 additions and 9 deletions
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17
src/test/org/apache/commons/math/stat/TestStatisticTest.java
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@ -23,7 +23,7 @@ import junit.framework.TestSuite;
/**
* Test cases for the TestStatistic class.
*
* @version $Revision: 1.12 $ $Date: 2004/03/07 20:47:06 $
* @version $Revision: 1.13 $ $Date: 2004/03/07 21:55:18 $
*/
public final class TestStatisticTest extends TestCase {
@ -212,14 +212,13 @@ public final class TestStatisticTest extends TestCase {
for (int i = 0; i < sample2.length; i++) {
sampleStats2.addValue(sample2[i]);
}
//FIXME: textbook example reported t stat uses pooled variance
// should replace the following two tests with R-verified example
assertEquals("two sample t stat", 1.634, testStatistic.t(sample1, sample2), 0.1);
assertEquals("two sample t stat", 1.634, testStatistic.t(sampleStats1, sampleStats2), 0.1);
// 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);
// These tests are OK, since book reports non-pooled exact p-value
assertEquals("two sample p value", 0.059, testStatistic.tTest(sample1, sample2) / 2d, 10E-3);
assertEquals("two sample p value", 0.059, testStatistic.tTest(sampleStats1, sampleStats2) / 2d, 10E-3);
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));
@ -278,7 +277,7 @@ public final class TestStatisticTest extends TestCase {
testStatistic.t(sampleStats1, tooShortStats);
fail("insufficient data, IllegalArgumentException expected");
} catch (IllegalArgumentException ex) {
// exptected
// expected
}
}
}