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Java > Open Source Codes > org > apache > commons > math > distribution > ChiSquaredDistribution


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.distribution;
17
18 /**
19  * The Chi-Squared Distribution.
20  *
21  * Instances of ChiSquaredDistribution objects should be created using
22  * {@link DistributionFactory#createChiSquareDistribution(double)}.
23  *
24  * <p>
25  * References:
26  * <ul>
27  * <li><a HREF="http://mathworld.wolfram.com/Chi-SquaredDistribution.html">
28  * Chi-Squared Distribution</a></li>
29  * </ul>
30  * </p>
31  *
32  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
33  */
34 public interface ChiSquaredDistribution extends ContinuousDistribution {
35     /**
36      * Modify the degrees of freedom.
37      * @param degreesOfFreedom the new degrees of freedom.
38      */
39     void setDegreesOfFreedom(double degreesOfFreedom);
40     
41     /**
42      * Access the degrees of freedom.
43      * @return the degrees of freedom.
44      */
45     double getDegreesOfFreedom();
46 }
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