org.statcato.statistics

Class PoissonProbabilityDistribution

java.lang.Object

org.statcato.statistics.DiscreteProbabilityDistribution

org.statcato.statistics.PoissonProbabilityDistribution

public class PoissonProbabilityDistribution
extends DiscreteProbabilityDistribution

Poisson probability distribution class.

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
PoissonProbabilityDistribution(double lambda) Constructs a poisson probability distribution with the given mean.

Method Summary

Modifier and Type	Method and Description
double	cumulativeProbability(double x) Returns the cumulative probabililty up to x.
double	density(double x) Returns the density of the distribution at x.
java.lang.Double	inverseCumulativeProbability(double area) Returns the inverse cumulative probability.

Methods inherited from class org.statcato.statistics.DiscreteProbabilityDistribution

inverseCumulativeProbability

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PoissonProbabilityDistribution

public PoissonProbabilityDistribution(double lambda)

Constructs a poisson probability distribution with the given mean.

Parameters:

lambda - mean

Method Detail

density

public double density(double x)

Returns the density of the distribution at x.

Specified by:

density in class DiscreteProbabilityDistribution

Parameters:

x -

Returns:

probability density at x

cumulativeProbability

public double cumulativeProbability(double x)

Returns the cumulative probabililty up to x.

Specified by:

cumulativeProbability in class DiscreteProbabilityDistribution

Parameters:

x -

Returns:

cumulative probability P(<=x)

inverseCumulativeProbability

public java.lang.Double inverseCumulativeProbability(double area)

Returns the inverse cumulative probability.

Parameters:

area - cumulative probability

Returns:

inverse cumulative probability