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Java > Open Source Codes > org > apache > commons > math > distribution > BinomialDistributionTest


1 /*
2  * Copyright 2003-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
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 $Revision$ $Date: 2005-02-26 05:11:52 -0800 (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 JavaDoc name) {
32         super(name);
33     }
34     
35     //-------------- Implementations for abstract methods -----------------------
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     //----------------- Additional test cases ---------------------------------
76
77     /** Test degenerate case p = 0 */
78     public void testDegenerate0() throws Exception JavaDoc {
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 JavaDoc {
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 }
106
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