umontreal.iro.lecuyer.randvar
Class LoglogisticGen

java.lang.Object
  umontreal.iro.lecuyer.randvar.RandomVariateGen
      umontreal.iro.lecuyer.randvar.LoglogisticGen

public class LoglogisticGen
extends RandomVariateGen

This class implements random variate generators for the log-logistic distribution with shape parameter α > 0 and scale parameter β > 0. The density function of this distribution is

f (x) = (α(x/β)^α-1)/(β[1 + (x/β)^α]²) for x > 0.

Constructor Summary

LoglogisticGen(RandomStream s, double alpha, double beta)
Creates a log-logistic random variate generator with parameters α = alpha and β = beta, using stream s.

LoglogisticGen(RandomStream s, LoglogisticDist dist)
Creates a new generator for the distribution dist, using stream s.

Method Summary

double	getAlpha() Returns the parameter α of this object.
double	getBeta() Returns the parameter β of this object.
static double	nextDouble(RandomStream s, double alpha, double beta) Generates a variate from the log-logistic distribution with shape parameter α > 0 and scale parameter β > 0.

Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGen

getDistribution, getStream, nextArrayOfDouble, nextDouble, setStream, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

LoglogisticGen

public LoglogisticGen(RandomStream s,
                      double alpha,
                      double beta)

Creates a log-logistic random variate generator with parameters α = alpha and β = beta, using stream s.

LoglogisticGen

public LoglogisticGen(RandomStream s,
                      LoglogisticDist dist)

Creates a new generator for the distribution dist, using stream s.

Method Detail

nextDouble

public static double nextDouble(RandomStream s,
                                double alpha,
                                double beta)

Generates a variate from the log-logistic distribution with shape parameter α > 0 and scale parameter β > 0.

getAlpha

public double getAlpha()

Returns the parameter α of this object.

getBeta

public double getBeta()

Returns the parameter β of this object.