jhplot.math.num.pdf
Class DiscreteDistribution

java.lang.Object
  jhplot.math.num.pdf.DiscreteDistribution

All Implemented Interfaces:

Distribution

Direct Known Subclasses:

Binomial, Geometric, Hypergeometric, NegativeBinomial, Poisson

public abstract class DiscreteDistribution
extends Object
implements Distribution

Base discrete distribution.

Since:

1.2

Version:

$Revision: 1.2 $ $Date: 2007/10/25 04:44:10 $

Constructor Summary

DiscreteDistribution()

Method Summary

abstract double	cumulativeProbability(int x) The CDF for this distribution.
abstract int	inverseCumulativeProbability(double p) The inverse CDF for this distribution.
abstract double	probability(int x) The PMF for this distribution.

Methods inherited from class java.lang.Object

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

Constructor Detail

DiscreteDistribution

public DiscreteDistribution()

Method Detail

cumulativeProbability

public abstract double cumulativeProbability(int x)
                                      throws NumericException

The CDF for this distribution. This method returns P(X ≤ x).

Parameters:

x - the value at which the CDF is evaluated.

Returns:

CDF for this distribution.

Throws:

NumericException - if the cumulative probability can not be computed.

inverseCumulativeProbability

public abstract int inverseCumulativeProbability(double p)
                                          throws NumericException

The inverse CDF for this distribution. This method returns the largest x such that, P(X ≤ x) ≤ p.

Parameters:

p - the cumulative probability.

Returns:

x

Throws:

NumericException - if the inverse cumulative probability can not be computed.

probability

public abstract double probability(int x)
                            throws NumericException

The PMF for this distribution. This method returns P(X = x).

Parameters:

x - the value at which the probability is evaluated.

Returns:

PMF for this distribution.

Throws:

NumericException - if the probability can not be computed.