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.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: }
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