2
* Licensed to the Apache Software Foundation (ASF) under one or more
3
* contributor license agreements. See the NOTICE file distributed with
4
* this work for additional information regarding copyright ownership.
5
* The ASF licenses this file to You under the Apache License, Version 2.0
6
* (the "License"); you may not use this file except in compliance with
7
* the License. You may obtain a copy of the License at
9
* http://www.apache.org/licenses/LICENSE-2.0
11
* Unless required by applicable law or agreed to in writing, software
12
* distributed under the License is distributed on an "AS IS" BASIS,
13
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14
* See the License for the specific language governing permissions and
15
* limitations under the License.
17
package org.apache.commons.math.stat;
19
import junit.framework.Test;
20
import junit.framework.TestCase;
21
import junit.framework.TestSuite;
23
import java.io.BufferedReader;
24
import java.io.InputStreamReader;
26
import org.apache.commons.math.stat.descriptive.SummaryStatistics;
27
import org.apache.commons.math.stat.descriptive.DescriptiveStatistics;
30
* Certified data test cases.
31
* @version $Revision: 762087 $ $Date: 2009-04-05 10:20:18 -0400 (Sun, 05 Apr 2009) $
33
public class CertifiedDataTest extends TestCase {
35
protected double mean = Double.NaN;
37
protected double std = Double.NaN;
40
* Certified Data Test Constructor
43
public CertifiedDataTest(String name) {
48
* @return The test suite
50
public static Test suite() {
51
TestSuite suite = new TestSuite(CertifiedDataTest.class);
52
suite.setName("Certified Tests");
57
* Test SummaryStatistics - implementations that do not store the data
58
* and use single pass algorithms to compute statistics
60
public void testSummaryStatistics() throws Exception {
61
SummaryStatistics u = new SummaryStatistics();
62
loadStats("data/PiDigits.txt", u);
63
assertEquals("PiDigits: std", std, u.getStandardDeviation(), 1E-13);
64
assertEquals("PiDigits: mean", mean, u.getMean(), 1E-13);
66
loadStats("data/Mavro.txt", u);
67
assertEquals("Mavro: std", std, u.getStandardDeviation(), 1E-14);
68
assertEquals("Mavro: mean", mean, u.getMean(), 1E-14);
70
loadStats("data/Michelso.txt", u);
71
assertEquals("Michelso: std", std, u.getStandardDeviation(), 1E-13);
72
assertEquals("Michelso: mean", mean, u.getMean(), 1E-13);
74
loadStats("data/NumAcc1.txt", u);
75
assertEquals("NumAcc1: std", std, u.getStandardDeviation(), 1E-14);
76
assertEquals("NumAcc1: mean", mean, u.getMean(), 1E-14);
78
loadStats("data/NumAcc2.txt", u);
79
assertEquals("NumAcc2: std", std, u.getStandardDeviation(), 1E-14);
80
assertEquals("NumAcc2: mean", mean, u.getMean(), 1E-14);
84
* Test DescriptiveStatistics - implementations that store full array of
85
* values and execute multi-pass algorithms
87
public void testDescriptiveStatistics() throws Exception {
89
DescriptiveStatistics u = new DescriptiveStatistics();
91
loadStats("data/PiDigits.txt", u);
92
assertEquals("PiDigits: std", std, u.getStandardDeviation(), 1E-14);
93
assertEquals("PiDigits: mean", mean, u.getMean(), 1E-14);
95
loadStats("data/Mavro.txt", u);
96
assertEquals("Mavro: std", std, u.getStandardDeviation(), 1E-14);
97
assertEquals("Mavro: mean", mean, u.getMean(), 1E-14);
99
loadStats("data/Michelso.txt", u);
100
assertEquals("Michelso: std", std, u.getStandardDeviation(), 1E-14);
101
assertEquals("Michelso: mean", mean, u.getMean(), 1E-14);
103
loadStats("data/NumAcc1.txt", u);
104
assertEquals("NumAcc1: std", std, u.getStandardDeviation(), 1E-14);
105
assertEquals("NumAcc1: mean", mean, u.getMean(), 1E-14);
107
loadStats("data/NumAcc2.txt", u);
108
assertEquals("NumAcc2: std", std, u.getStandardDeviation(), 1E-14);
109
assertEquals("NumAcc2: mean", mean, u.getMean(), 1E-14);
113
* loads a DescriptiveStatistics off of a test file
115
* @param statistical summary
117
private void loadStats(String resource, Object u) throws Exception {
119
DescriptiveStatistics d = null;
120
SummaryStatistics s = null;
121
if (u instanceof DescriptiveStatistics) {
122
d = (DescriptiveStatistics) u;
124
s = (SummaryStatistics) u;
126
u.getClass().getDeclaredMethod(
127
"clear", new Class[]{}).invoke(u, new Object[]{});
133
new InputStreamReader(
134
CertifiedDataTest.class.getResourceAsStream(resource)));
138
for (int j = 0; j < 60; j++) {
139
line = in.readLine();
143
line.substring(line.lastIndexOf(":") + 1).trim());
148
line.substring(line.lastIndexOf(":") + 1).trim());
152
line = in.readLine();
154
while (line != null) {
156
d.addValue(Double.parseDouble(line.trim()));
158
s.addValue(Double.parseDouble(line.trim()));
160
line = in.readLine();