01: /*
02: * Copyright 2003-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: * Returns the median of the available values. This is the same as the 50th percentile.
22: * See {@link Percentile} for a description of the algorithm used.
23: * <p>
24: * <strong>Note that this implementation is not synchronized.</strong> If
25: * multiple threads access an instance of this class concurrently, and at least
26: * one of the threads invokes the <code>increment()</code> or
27: * <code>clear()</code> method, it must be synchronized externally.
28: *
29: * @version $Revision: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $
30: */
31: public class Median extends Percentile implements Serializable {
32:
33: /** Serializable version identifier */
34: private static final long serialVersionUID = -3961477041290915687L;
35:
36: /**
37: * Default constructor.
38: */
39: public Median() {
40: super (50.0);
41: }
42:
43: }
|