1 /*
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
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
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.
16 */
17 package org.apache.commons.math.stat.descriptive.rank;
18
19 import java.io.Serializable;
20
21
22 /**
23 * Returns the median of the available values. This is the same as the 50th percentile.
24 * See {@link Percentile} for a description of the algorithm used.
25 * <p>
26 * <strong>Note that this implementation is not synchronized.</strong> If
27 * multiple threads access an instance of this class concurrently, and at least
28 * one of the threads invokes the <code>increment()</code> or
29 * <code>clear()</code> method, it must be synchronized externally.</p>
30 *
31 * @version $Revision: 617953 $ $Date: 2008-02-02 22:54:00 -0700 (Sat, 02 Feb 2008) $
32 */
33 public class Median extends Percentile implements Serializable {
34
35 /** Serializable version identifier */
36 private static final long serialVersionUID = -3961477041290915687L;
37
38 /**
39 * Default constructor.
40 */
41 public Median() {
42 super(50.0);
43 }
44
45 }