| /* |
| * 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; |
| |
| import org.apache.commons.math.MathException; |
| |
| /** |
| * Interface representing the Poisson Distribution. |
| * |
| * <p> |
| * References: |
| * <ul> |
| * <li><a href="http://mathworld.wolfram.com/PoissonDistribution.html"> |
| * Poisson distribution</a></li> |
| * </ul> |
| * </p> |
| * |
| * @version $Revision: 920852 $ $Date: 2010-03-09 13:53:44 +0100 (mar. 09 mars 2010) $ |
| */ |
| public interface PoissonDistribution extends IntegerDistribution { |
| |
| /** |
| * Get the mean for the distribution. |
| * |
| * @return the mean for the distribution. |
| */ |
| double getMean(); |
| |
| /** |
| * Set the mean for the distribution. |
| * The parameter value must be positive; otherwise an |
| * <code>IllegalArgument</code> is thrown. |
| * |
| * @param p the mean |
| * @throws IllegalArgumentException if p ≤ 0 |
| * @deprecated as of v2.1 |
| */ |
| @Deprecated |
| void setMean(double p); |
| |
| /** |
| * Calculates the Poisson distribution function using a normal approximation. |
| * |
| * @param x the upper bound, inclusive |
| * @return the distribution function value calculated using a normal approximation |
| * @throws MathException if an error occurs computing the normal approximation |
| */ |
| double normalApproximateProbability(int x) throws MathException; |
| |
| } |