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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  }