1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 package org.apache.commons.math.stat.descriptive.rank;
17
18 import junit.framework.Test;
19 import junit.framework.TestSuite;
20
21 import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
22 import org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest;
23
24 /***
25 * Test cases for the {@link UnivariateStatistic} class.
26 * @version $Revision: 1.1 $ $Date: 2004/10/08 05:08:20 $
27 */
28 public class PercentileTest extends UnivariateStatisticAbstractTest{
29
30 protected Percentile stat;
31
32 /***
33 * @param name
34 */
35 public PercentileTest(String name) {
36 super(name);
37 }
38
39 public static Test suite() {
40 TestSuite suite = new TestSuite(PercentileTest.class);
41 suite.setName("Percentile Tests");
42 return suite;
43 }
44
45
46
47
48 public UnivariateStatistic getUnivariateStatistic() {
49 return new Percentile(95.0);
50 }
51
52
53
54
55 public double expectedValue() {
56 return this.percentile95;
57 }
58
59 public void testHighPercentile(){
60 double[] d = new double[]{1, 2, 3};
61 Percentile p = new Percentile(75);
62 assertEquals(3.0, p.evaluate(d), 1.0e-5);
63 }
64
65 public void testPercentile() {
66 double[] d = new double[] {1, 3, 2, 4};
67 Percentile p = new Percentile(30);
68 assertEquals(1.5, p.evaluate(d), 1.0e-5);
69 p.setQuantile(25);
70 assertEquals(1.25, p.evaluate(d), 1.0e-5);
71 p.setQuantile(75);
72 assertEquals(3.75, p.evaluate(d), 1.0e-5);
73 p.setQuantile(50);
74 assertEquals(2.5, p.evaluate(d), 1.0e-5);
75 }
76
77 public void testNISTExample() {
78 double[] d = new double[] {95.1772, 95.1567, 95.1937, 95.1959,
79 95.1442, 95.0610, 95.1591, 95.1195, 95.1772, 95.0925, 95.1990, 95.1682
80 };
81 Percentile p = new Percentile(90);
82 assertEquals(95.1981, p.evaluate(d), 1.0e-4);
83 assertEquals(95.1990, p.evaluate(d,0,d.length, 100d), 0);
84 }
85
86 public void test5() {
87 Percentile percentile = new Percentile(5);
88 assertEquals(this.percentile5, percentile.evaluate(testArray), getTolerance());
89 }
90
91 public void testNullEmpty() {
92 Percentile percentile = new Percentile(50);
93 double[] nullArray = null;
94 double[] emptyArray = new double[] {};
95 try {
96 percentile.evaluate(nullArray);
97 fail("Expecting IllegalArgumentException for null array");
98 } catch (IllegalArgumentException ex) {
99
100 }
101 assertTrue(Double.isNaN(percentile.evaluate(emptyArray)));
102 }
103
104 public void testSingleton() {
105 Percentile percentile = new Percentile(50);
106 double[] singletonArray = new double[] {1d};
107 assertEquals(1d, percentile.evaluate(singletonArray), 0);
108 assertEquals(1d, percentile.evaluate(singletonArray, 0, 1), 0);
109 assertEquals(1d, percentile.evaluate(singletonArray, 0, 1, 5), 0);
110 assertEquals(1d, percentile.evaluate(singletonArray, 0, 1, 100), 0);
111 assertTrue(Double.isNaN(percentile.evaluate(singletonArray, 0, 0)));
112 }
113
114 public void testSpecialValues() {
115 Percentile percentile = new Percentile(50);
116 double[] specialValues = new double[] {0d, 1d, 2d, 3d, 4d, Double.NaN};
117 assertEquals(2.5d, percentile.evaluate(specialValues), 0);
118 specialValues = new double[] {Double.NEGATIVE_INFINITY, 1d, 2d, 3d,
119 Double.NaN, Double.POSITIVE_INFINITY};
120 assertEquals(2.5d, percentile.evaluate(specialValues), 0);
121 specialValues = new double[] {1d, 1d, Double.POSITIVE_INFINITY,
122 Double.POSITIVE_INFINITY};
123 assertTrue(Double.isInfinite(percentile.evaluate(specialValues)));
124 specialValues = new double[] {1d, 1d, Double.NaN,
125 Double.NaN};
126 assertTrue(Double.isNaN(percentile.evaluate(specialValues)));
127 specialValues = new double[] {1d, 1d, Double.NEGATIVE_INFINITY,
128 Double.NEGATIVE_INFINITY};
129
130 assertTrue(Double.isNaN(percentile.evaluate(specialValues)));
131 }
132
133 public void testSetQuantile() {
134 Percentile percentile = new Percentile(10);
135 percentile.setQuantile(100);
136 assertEquals(100, percentile.getQuantile(), 0);
137 try {
138 percentile.setQuantile(0);
139 fail("Expecting IllegalArgumentException");
140 } catch (IllegalArgumentException ex) {
141
142 }
143 try {
144 percentile = new Percentile(0);
145 fail("Expecting IllegalArgumentException");
146 } catch (IllegalArgumentException ex) {
147
148 }
149 }
150
151 }