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Added test case using 2-way table containing zeros (illustrates PR #32531).

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Increased accuracy of target values in one test case.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141505 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-12-04 20:52:43 +00:00
parent a39153784e
commit facf275db4
1 changed files with 12 additions and 2 deletions
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14
src/test/org/apache/commons/math/stat/inference/ChiSquareTestTest.java
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@ -22,7 +22,7 @@ import junit.framework.TestSuite;
/**
* Test cases for the ChiSquareTestImpl class.
*
* @version $Revision: 1.3 $ $Date: 2004/06/26 22:09:07 $
* @version $Revision: 1.4 $ $Date: 2004/12/04 20:52:43 $
*/
public final class ChiSquareTestTest extends TestCase {
@ -113,7 +113,7 @@ public final class ChiSquareTestTest extends TestCase {
// Target values computed using R version 1.8.1
long[][] counts = { {40, 22, 43}, {91, 21, 28}, {60, 10, 22}};
assertEquals( "chi-square test statistic", 22.709, testStatistic.chiSquare(counts), 1E-3);
assertEquals( "chi-square test statistic", 22.709027688, testStatistic.chiSquare(counts), 1E-9);
assertEquals("chi-square p-value", 0.0001448, testStatistic.chiSquareTest(counts), 1E-7);
assertTrue("chi-square test reject", testStatistic.chiSquareTest(counts, 0.0002));
assertTrue("chi-square test accept", !testStatistic.chiSquareTest(counts, 0.0001));
@ -180,4 +180,14 @@ public final class ChiSquareTestTest extends TestCase {
double cst = csti.chiSquareTest(exp, obs);
assertEquals("chi-square p-value", 0.0, cst, 1E-3);
}
/** Contingency table containing zeros - PR # 32531 */
public void testChiSquareZeroCount() throws Exception {
// Target values computed using R version 1.8.1
long[][] counts = { {40, 0, 4}, {91, 1, 2}, {60, 2, 0}};
assertEquals( "chi-square test statistic", 9.67444662263,
testStatistic.chiSquare(counts), 1E-9);
assertEquals("chi-square p-value", 0.0462835770603,
testStatistic.chiSquareTest(counts), 1E-9);
}
}