org.apache.commons.math.distribution
Interface PoissonDistribution

All Superinterfaces:

DiscreteDistribution, Distribution, IntegerDistribution

All Known Implementing Classes:

PoissonDistributionImpl

public interface PoissonDistribution
extends IntegerDistribution

Interface representing the Poisson Distribution.

References:

• Poisson distribution

Version:

$Id: PoissonDistribution.java 1178295 2011-10-03 04:36:27Z psteitz $

Method Summary

double	getMean() Get the mean for the distribution.
double	normalApproximateProbability(int x) Calculates the Poisson distribution function using a normal approximation.

Methods inherited from interface org.apache.commons.math.distribution.IntegerDistribution

cumulativeProbability, cumulativeProbability, inverseCumulativeProbability, probability, reseedRandomGenerator, sample, sample

Methods inherited from interface org.apache.commons.math.distribution.DiscreteDistribution

probability

Methods inherited from interface org.apache.commons.math.distribution.Distribution

cumulativeProbability, cumulativeProbability, getNumericalMean, getNumericalVariance, isSupportConnected, isSupportLowerBoundInclusive, isSupportUpperBoundInclusive

Method Detail

getMean

double getMean()

Get the mean for the distribution.

Returns:

the mean for the distribution.

normalApproximateProbability

double normalApproximateProbability(int x)

Calculates the Poisson distribution function using a normal approximation.

Parameters:

x - the upper bound, inclusive

Returns:

the distribution function value calculated using a normal approximation