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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.distribution;
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import org.apache.commons.math.MathException;
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* Interface representing the Poisson Distribution.
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* <li><a href="http://mathworld.wolfram.com/PoissonDistribution.html">
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* Poisson distribution</a></li>
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* @version $Revision: 480440 $ $Date: 2006-11-29 00:14:12 -0700 (Wed, 29 Nov 2006) $
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public interface PoissonDistribution extends IntegerDistribution {
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* Get the mean for the distribution.
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* @return the mean for the distribution.
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public double getMean();
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* Set the mean for the distribution.
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* The parameter value must be positive; otherwise an
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* <code>IllegalArgument</code> is thrown.
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* @throws IllegalArgumentException if p ≤ 0
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public void setMean(double p);
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* Calculates the Poisson distribution function using a normal approximation.
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* @param x the upper bound, inclusive
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* @return the distribution function value calculated using a normal approximation
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* @throws MathException if an error occurs computing the normal approximation
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public double normalApproximateProbability(int x) throws MathException;
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