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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  }