/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math.stat.descriptive.rank;

import java.io.Serializable;

/**
 * Returns the median of the available values. This is the same as the 50th
 * percentile. See {@link Percentile} for a description of the algorithm used.
 * <p>
 * <strong>Note that this implementation is not synchronized.</strong> If
 * multiple threads access an instance of this class concurrently, and at least
 * one of the threads invokes the <code>increment()</code> or
 * <code>clear()</code> method, it must be synchronized externally.
 * </p>
 * 
 * @version $Revision$ $Date$
 */
public class Median extends Percentile implements Serializable {

	/** Serializable version identifier */
	private static final long serialVersionUID = -3961477041290915687L;

	/**
	 * Default constructor.
	 */
	public Median() {
		super(50.0);
	}

	/**
	 * Copy constructor, creates a new {@code Median} identical to the
	 * {@code original}
	 * 
	 * @param original
	 *            the {@code Median} instance to copy
	 */
	public Median(Median original) {
		super(original);
	}

}