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 }