org.statcato.statistics
Class PoissonProbabilityDistribution

java.lang.Object
  extended by org.statcato.statistics.DiscreteProbabilityDistribution
      extended by org.statcato.statistics.PoissonProbabilityDistribution

public class PoissonProbabilityDistribution
extends DiscreteProbabilityDistribution

Poisson probability distribution class.

Since:
1.0
Version:
%I%, %G%
Author:
Margaret Yau

Constructor Summary
PoissonProbabilityDistribution(double lambda)
          Constructs a poisson probability distribution with the given mean.
 
Method Summary
 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
clone, equals, finalize, 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