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Added test case for small samples, adjusted for PR #29050 changes. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141240 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-05-23 05:06:20 +00:00
parent 2552cb1aee
commit 414788a045
1 changed files with 13 additions and 6 deletions
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19
src/test/org/apache/commons/math/stat/inference/TTestTest.java
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@ -23,7 +23,7 @@ import org.apache.commons.math.stat.univariate.SummaryStatistics;
/** /**
* Test cases for the TTestImpl class. * Test cases for the TTestImpl class.
* *
* @version $Revision: 1.1 $ $Date: 2004/05/03 03:04:54 $ * @version $Revision: 1.2 $ $Date: 2004/05/23 05:06:20 $
*/ */
public final class TTestTest extends TestCase { public final class TTestTest extends TestCase {
@ -91,29 +91,28 @@ public final class TTestTest extends TestCase {
double[] tooShortObs = { 1.0 }; double[] tooShortObs = { 1.0 };
try { try {
testStatistic.t(mu, tooShortObs); testStatistic.t(mu, tooShortObs);
fail("arguments too short, IllegalArgumentException expected"); fail("insufficient data to compute t statistic, IllegalArgumentException expected");
} catch (IllegalArgumentException ex) { } catch (IllegalArgumentException ex) {
// exptected // exptected
} }
try { try {
testStatistic.tTest(mu, tooShortObs); testStatistic.tTest(mu, tooShortObs);
fail("arguments too short, IllegalArgumentException expected"); fail("insufficient data to perform t test, IllegalArgumentException expected");
} catch (IllegalArgumentException ex) { } catch (IllegalArgumentException ex) {
// expected // expected
} }
SummaryStatistics tooShortStats = SummaryStatistics.newInstance(); SummaryStatistics tooShortStats = SummaryStatistics.newInstance();
tooShortStats.addValue(0d); tooShortStats.addValue(0d);
tooShortStats.addValue(2d);
try { try {
testStatistic.t(mu, tooShortStats); testStatistic.t(mu, tooShortStats);
fail("arguments too short, IllegalArgumentException expected"); fail("insufficient data to compute t statistic, IllegalArgumentException expected");
} catch (IllegalArgumentException ex) { } catch (IllegalArgumentException ex) {
// exptected // exptected
} }
try { try {
testStatistic.tTest(mu, tooShortStats); testStatistic.tTest(mu, tooShortStats);
fail("arguments too short, IllegalArgumentException expected"); fail("insufficient data to perform t test, IllegalArgumentException expected");
} catch (IllegalArgumentException ex) { } catch (IllegalArgumentException ex) {
// exptected // exptected
} }
@ -225,4 +224,12 @@ public final class TTestTest extends TestCase {
// expected // 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);
}
} }