001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.math.distribution; 018 019 /** 020 * Test cases for BinomialDistribution. 021 * Extends IntegerDistributionAbstractTest. See class javadoc for 022 * IntegerDistributionAbstractTest for details. 023 * 024 * @version $Revision: 762087 $ $Date: 2009-04-05 10:20:18 -0400 (Sun, 05 Apr 2009) $ 025 */ 026 public class BinomialDistributionTest extends IntegerDistributionAbstractTest { 027 028 /** 029 * Constructor for BinomialDistributionTest. 030 * @param name 031 */ 032 public BinomialDistributionTest(String name) { 033 super(name); 034 } 035 036 //-------------- Implementations for abstract methods ----------------------- 037 038 /** Creates the default discrete distribution instance to use in tests. */ 039 @Override 040 public IntegerDistribution makeDistribution() { 041 return new BinomialDistributionImpl(10,0.70); 042 } 043 044 /** Creates the default probability density test input values */ 045 @Override 046 public int[] makeDensityTestPoints() { 047 return new int[] {-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}; 048 } 049 050 /** Creates the default probability density test expected values */ 051 @Override 052 public double[] makeDensityTestValues() { 053 return new double[] {0d, 0.0000d, 0.0001d, 0.0014d, 0.0090d, 0.0368d, 0.1029d, 054 0.2001d, 0.2668d, 0.2335d, 0.1211d, 0.0282d, 0d}; 055 } 056 057 /** Creates the default cumulative probability density test input values */ 058 @Override 059 public int[] makeCumulativeTestPoints() { 060 return makeDensityTestPoints(); 061 } 062 063 /** Creates the default cumulative probability density test expected values */ 064 @Override 065 public double[] makeCumulativeTestValues() { 066 return new double[] {0d, 0.0000d, 0.0001d, 0.0016d, 0.0106d, 0.0473d, 067 0.1503d, 0.3504d, 0.6172d, 0.8507d, 0.9718d, 1d, 1d}; 068 } 069 070 /** Creates the default inverse cumulative probability test input values */ 071 @Override 072 public double[] makeInverseCumulativeTestPoints() { 073 return new double[] {0, 0.001d, 0.010d, 0.025d, 0.050d, 0.100d, 0.999d, 074 0.990d, 0.975d, 0.950d, 0.900d,1}; 075 } 076 077 /** Creates the default inverse cumulative probability density test expected values */ 078 @Override 079 public int[] makeInverseCumulativeTestValues() { 080 return new int[] {-1, 1, 2, 3, 4, 4, 9, 9, 9, 8, 8, Integer.MAX_VALUE}; 081 } 082 083 //----------------- Additional test cases --------------------------------- 084 085 /** Test degenerate case p = 0 */ 086 public void testDegenerate0() throws Exception { 087 setDistribution(new BinomialDistributionImpl(5,0.0d)); 088 setCumulativeTestPoints(new int[] {-1, 0, 1, 5, 10 }); 089 setCumulativeTestValues(new double[] {0d, 1d, 1d, 1d, 1d}); 090 setDensityTestPoints(new int[] {-1, 0, 1, 10, 11}); 091 setDensityTestValues(new double[] {0d, 1d, 0d, 0d, 0d}); 092 setInverseCumulativeTestPoints(new double[] {0.1d, 0.5d}); 093 setInverseCumulativeTestValues(new int[] {-1, -1}); 094 verifyDensities(); 095 verifyCumulativeProbabilities(); 096 verifyInverseCumulativeProbabilities(); 097 } 098 099 /** Test degenerate case p = 1 */ 100 public void testDegenerate1() throws Exception { 101 setDistribution(new BinomialDistributionImpl(5,1.0d)); 102 setCumulativeTestPoints(new int[] {-1, 0, 1, 2, 5, 10 }); 103 setCumulativeTestValues(new double[] {0d, 0d, 0d, 0d, 1d, 1d}); 104 setDensityTestPoints(new int[] {-1, 0, 1, 2, 5, 10}); 105 setDensityTestValues(new double[] {0d, 0d, 0d, 0d, 1d, 0d}); 106 setInverseCumulativeTestPoints(new double[] {0.1d, 0.5d}); 107 setInverseCumulativeTestValues(new int[] {4, 4}); 108 verifyDensities(); 109 verifyCumulativeProbabilities(); 110 verifyInverseCumulativeProbabilities(); 111 } 112 113 }