001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.math.stat.descriptive.rank; 018 019 import java.io.Serializable; 020 021 022 /** 023 * Returns the median of the available values. This is the same as the 50th percentile. 024 * See {@link Percentile} for a description of the algorithm used. 025 * <p> 026 * <strong>Note that this implementation is not synchronized.</strong> If 027 * multiple threads access an instance of this class concurrently, and at least 028 * one of the threads invokes the <code>increment()</code> or 029 * <code>clear()</code> method, it must be synchronized externally.</p> 030 * 031 * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $ 032 */ 033 public class Median extends Percentile implements Serializable { 034 035 /** Serializable version identifier */ 036 private static final long serialVersionUID = -3961477041290915687L; 037 038 /** 039 * Default constructor. 040 */ 041 public Median() { 042 super(50.0); 043 } 044 045 /** 046 * Copy constructor, creates a new {@code Median} identical 047 * to the {@code original} 048 * 049 * @param original the {@code Median} instance to copy 050 */ 051 public Median(Median original) { 052 super(original); 053 } 054 055 }