Utility
Class Beta

java.lang.Object
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  +--Utility.RandomNumber
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        +--Utility.Beta

public class Beta

extends RandomNumber

Beta is used to generate random variables from the Beta distribution. A specific beta distribution is characterized by two parameters, both representing degrees of freedom.

This is a continuous distribution.

Tests Performed
1000 samples were generated and the means and variances were examined. Subjectively, they seemed correct. Goodness of fit tests where not performed.

Constructor Summary

Beta(int degsFreedom1, int degsFreedom2)
Beta constructor.

Method Summary

double	sampleDouble() The sampleDouble function returns a random variable that is chosen from a beta distribution with parameters as set in the constructor.
int	sampleInt() The sampleInt function should not be called for this continuous distribution.

Methods inherited from class Utility.RandomNumber

goodnessOfFitTest, goodnessOfFitTest, randomMixer, resetRandomMixer, sample01

Methods inherited from class java.lang.Object

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

Constructor Detail

Beta

public Beta(int degsFreedom1,
            int degsFreedom2)

Beta constructor. Initialize the parameters of the beta distribution.

Parameters:

degsFreedom1 - The first degrees of freedom parameter

degsFreedom2 - The second degrees of freedom parameter

Method Detail

sampleDouble

public double sampleDouble()

The sampleDouble function returns a random variable that is chosen from a beta distribution with parameters as set in the constructor.
Algorithm is found in Knuth, "The Art of Comp. Programming" Volume 2.

Overrides:

sampleDouble in class RandomNumber

See Also:

Beta(int, int)

sampleInt

public int sampleInt()

The sampleInt function should not be called for this continuous distribution.

Overrides:

sampleInt in class RandomNumber