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Java > Open Source Codes > org > apache > commons > math > stat > descriptive > rank > Median


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.rank;
17
18 import java.io.Serializable JavaDoc;
19
20
21 /**
22  * Returns the median of the available values. This is the same as the 50th percentile.
23  * See {@link Percentile} for a description of the algorithm used.
24  * <p>
25  * <strong>Note that this implementation is not synchronized.</strong> If
26  * multiple threads access an instance of this class concurrently, and at least
27  * one of the threads invokes the <code>increment()</code> or
28  * <code>clear()</code> method, it must be synchronized externally.
29  *
30  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
31  */
32 public class Median extends Percentile implements Serializable JavaDoc {
33
34     /** Serializable version identifier */
35     static final long serialVersionUID = -3961477041290915687L;
36
37     /**
38      * Default constructor.
39      */
40     public Median() {
41         super(50.0);
42     }
43
44 }
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