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Posted to dev@commons.apache.org by ps...@apache.org on 2004/04/11 22:30:46 UTC
cvs commit: jakarta-commons/math/src/test/org/apache/commons/math/stat/inference TestStatisticTest.java
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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