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16 package org.apache.commons.math.distribution;
17
18 /**
19 * Test cases for BinomialDistribution.
20 * Extends IntegerDistributionAbstractTest. See class javadoc for
21 * IntegerDistributionAbstractTest for details.
22 *
23 * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
24 */
25 public class BinomialDistributionTest extends IntegerDistributionAbstractTest {
26
27 /**
28 * Constructor for BinomialDistributionTest.
29 * @param name
30 */
31 public BinomialDistributionTest(String name) {
32 super(name);
33 }
34
35
36
37 /** Creates the default discrete distribution instance to use in tests. */
38 public IntegerDistribution makeDistribution() {
39 return DistributionFactory.newInstance().createBinomialDistribution(10,0.70);
40 }
41
42 /** Creates the default probability density test input values */
43 public int[] makeDensityTestPoints() {
44 return new int[] {-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
45 }
46
47 /** Creates the default probability density test expected values */
48 public double[] makeDensityTestValues() {
49 return new double[] {0d, 0.0000d, 0.0001d, 0.0014d, 0.0090d, 0.0368d, 0.1029d,
50 0.2001d, 0.2668d, 0.2335d, 0.1211d, 0.0282d, 0d};
51 }
52
53 /** Creates the default cumulative probability density test input values */
54 public int[] makeCumulativeTestPoints() {
55 return makeDensityTestPoints();
56 }
57
58 /** Creates the default cumulative probability density test expected values */
59 public double[] makeCumulativeTestValues() {
60 return new double[] {0d, 0.0000d, 0.0001d, 0.0016d, 0.0106d, 0.0473d,
61 0.1503d, 0.3504d, 0.6172d, 0.8507d, 0.9718d, 1d, 1d};
62 }
63
64 /** Creates the default inverse cumulative probability test input values */
65 public double[] makeInverseCumulativeTestPoints() {
66 return new double[] {0, 0.001d, 0.010d, 0.025d, 0.050d, 0.100d, 0.999d,
67 0.990d, 0.975d, 0.950d, 0.900d,1};
68 }
69
70 /** Creates the default inverse cumulative probability density test expected values */
71 public int[] makeInverseCumulativeTestValues() {
72 return new int[] {-1, 1, 2, 3, 4, 4, 9, 9, 9, 8, 8, Integer.MAX_VALUE};
73 }
74
75
76
77 /** Test degenerate case p = 0 */
78 public void testDegenerate0() throws Exception {
79 setDistribution(DistributionFactory.newInstance().createBinomialDistribution(5,0.0d));
80 setCumulativeTestPoints(new int[] {-1, 0, 1, 5, 10 });
81 setCumulativeTestValues(new double[] {0d, 1d, 1d, 1d, 1d});
82 setDensityTestPoints(new int[] {-1, 0, 1, 10, 11});
83 setDensityTestValues(new double[] {0d, 1d, 0d, 0d, 0d});
84 setInverseCumulativeTestPoints(new double[] {0.1d, 0.5d});
85 setInverseCumulativeTestValues(new int[] {-1, -1});
86 verifyDensities();
87 verifyCumulativeProbabilities();
88 verifyInverseCumulativeProbabilities();
89 }
90
91 /** Test degenerate case p = 1 */
92 public void testDegenerate1() throws Exception {
93 setDistribution(DistributionFactory.newInstance().createBinomialDistribution(5,1.0d));
94 setCumulativeTestPoints(new int[] {-1, 0, 1, 2, 5, 10 });
95 setCumulativeTestValues(new double[] {0d, 0d, 0d, 0d, 1d, 1d});
96 setDensityTestPoints(new int[] {-1, 0, 1, 2, 5, 10});
97 setDensityTestValues(new double[] {0d, 0d, 0d, 0d, 1d, 0d});
98 setInverseCumulativeTestPoints(new double[] {0.1d, 0.5d});
99 setInverseCumulativeTestValues(new int[] {4, 4});
100 verifyDensities();
101 verifyCumulativeProbabilities();
102 verifyInverseCumulativeProbabilities();
103 }
104
105 }