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Java > Open Source Codes > org > apache > commons > math > stat > descriptive > InteractionTest


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.stat.descriptive;
17
18 import org.apache.commons.math.stat.descriptive.moment.FourthMoment;
19 import org.apache.commons.math.stat.descriptive.moment.Kurtosis;
20 import org.apache.commons.math.stat.descriptive.moment.Mean;
21 import org.apache.commons.math.stat.descriptive.moment.Skewness;
22 import org.apache.commons.math.stat.descriptive.moment.Variance;
23
24 import junit.framework.TestCase;
25
26 /**
27  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
28  */
29 public class InteractionTest extends TestCase {
30
31     protected double mean = 12.40454545454550;
32     protected double var = 10.00235930735930;
33     protected double skew = 1.437423729196190;
34     protected double kurt = 2.377191264804700;
35
36     protected double tolerance = 10E-12;
37
38     protected double[] testArray =
39         {
40             12.5,
41             12,
42             11.8,
43             14.2,
44             14.9,
45             14.5,
46             21,
47             8.2,
48             10.3,
49             11.3,
50             14.1,
51             9.9,
52             12.2,
53             12,
54             12.1,
55             11,
56             19.8,
57             11,
58             10,
59             8.8,
60             9,
61             12.3 };
62
63     public InteractionTest(String JavaDoc name) {
64         super(name);
65     }
66
67
68     public void testInteraction() {
69         
70         FourthMoment m4 = new FourthMoment();
71         Mean m = new Mean(m4);
72         Variance v = new Variance(m4);
73         Skewness s= new Skewness(m4);
74         Kurtosis k = new Kurtosis(m4);
75
76         for (int i = 0; i < testArray.length; i++){
77             m4.increment(testArray[i]);
78         }
79         
80         assertEquals(mean,m.getResult(),tolerance);
81         assertEquals(var,v.getResult(),tolerance);
82         assertEquals(skew ,s.getResult(),tolerance);
83         assertEquals(kurt,k.getResult(),tolerance);
84
85     }
86
87 }
88
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