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The Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math.distribution;

/**
 * The Chi-Squared Distribution.
 *
 * 
 * References:
 * 

 * 
 * Chi-Squared Distribution
 * 
 * 
 *
 * @version $Revision: 693598 $ $Date: 2008-09-09 16:37:08 -0400 (Tue, 09 Sep 2008) $
 */
public interface ChiSquaredDistribution extends ContinuousDistribution, HasDensity {
    /**
     * Modify the degrees of freedom.
     * @param degreesOfFreedom the new degrees of freedom.
     */
    void setDegreesOfFreedom(double degreesOfFreedom);
    
    /**
     * Access the degrees of freedom.
     * @return the degrees of freedom.
     */
    double getDegreesOfFreedom();

    /**
     * Return the probability density for a particular point.
     * @param x  The point at which the density should be computed.
     * @return  The pdf at point x.
     */
    double density(Double x);
}