001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.math.distribution; 018 019 /** 020 * Student's t-Distribution. 021 * 022 * <p> 023 * References: 024 * <ul> 025 * <li><a href="http://mathworld.wolfram.com/Studentst-Distribution.html"> 026 * Student's t-Distribution</a></li> 027 * </ul> 028 * </p> 029 * 030 * @version $Revision: 670469 $ $Date: 2008-06-23 04:01:38 -0400 (Mon, 23 Jun 2008) $ 031 */ 032 public interface TDistribution extends ContinuousDistribution { 033 /** 034 * Modify the degrees of freedom. 035 * @param degreesOfFreedom the new degrees of freedom. 036 */ 037 void setDegreesOfFreedom(double degreesOfFreedom); 038 039 /** 040 * Access the degrees of freedom. 041 * @return the degrees of freedom. 042 */ 043 double getDegreesOfFreedom(); 044 }