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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.distribution;
17  
18  /**
19   * Student's t-Distribution.
20   *
21   * Instances of TDistribution objects should be created using
22   * {@link DistributionFactory#createTDistribution(double)}
23   *
24   * <p>
25   * References:
26   * <ul>
27   * <li><a href="http://mathworld.wolfram.com/Studentst-Distribution.html">
28   * Student's t-Distribution</a></li>
29   * </ul>
30   * </p>
31   *
32   * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
33   */
34  public interface TDistribution 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  }