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;
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: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $
31 */
32 public class Median extends Percentile implements Serializable {
33
34 /** Serializable version identifier */
35 private static final long serialVersionUID = -3961477041290915687L;
36
37 /**
38 * Default constructor.
39 */
40 public Median() {
41 super(50.0);
42 }
43
44 }