org.apache.commons.math.distribution
Interface DiscreteDistribution

All Superinterfaces:

Distribution

All Known Subinterfaces:

BinomialDistribution, HypergeometricDistribution, IntegerDistribution, PoissonDistribution

All Known Implementing Classes:

AbstractIntegerDistribution, BinomialDistributionImpl, HypergeometricDistributionImpl, PoissonDistributionImpl

public interface DiscreteDistribution

extends Distribution

Base interface for discrete distributions.

Version:

$Revision: 1.17 $ $Date: 2004/11/07 03:32:48 $

Method Summary

double

probability(double x) For a random variable X whose values are distributed according to this distribution, this method returns P(X = x).

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

cumulativeProbability, cumulativeProbability

Method Detail

probability

public double probability(double x)

For a random variable X whose values are distributed according to this distribution, this method returns P(X = x). In other words, this method represents the probability mass function, or PMF for the distribution.

Parameters:

x - the value at which the probability mass function is evaluated.

Returns:

the value of the probability mass function at x