jdistlib

Class BetaBinomial

java.lang.Object

jdistlib.generic.GenericDistribution

jdistlib.BetaBinomial

public class BetaBinomial
extends GenericDistribution

Beta binomial distribution, taken from gamlss.dist package, plus some underflow guard. Parameterization: mu, sigma, bd.

Constructor Summary

Constructors

Constructor and Description
BetaBinomial(double mu, double sigma, int bd)

Method Summary

Modifier and Type	Method and Description
double	cumulative(double p, boolean lower_tail, boolean log_p)
static double	cumulative(double q, double mu, double sigma, double bd, boolean lower_tail, boolean log_p) Cumulative.
double	density(double x, boolean log)
static double	density(double x, double mu, double sigma, double bd, boolean give_log) Density
double	quantile(double q, boolean lower_tail, boolean log_p)
static double	quantile(double p, double mu, double sigma, double bd, boolean lower_tail, boolean log_p) Quantile.
double	random()
static double	random(double mu, double sigma, double bd, RandomEngine random) Random variate
static double[]	random(int n, double mu, double sigma, double bd, RandomEngine random)

Methods inherited from class jdistlib.generic.GenericDistribution

cumulative_hazard, cumulative_hazard, cumulative, cumulative, cumulative, density, density, getRandomEngine, hazard, hazard, inverse_survival, inverse_survival, quantile, quantile, quantile, random, random, setRandomEngine, survival, survival, survival

Methods inherited from class java.lang.Object

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

Constructor Detail

BetaBinomial

public BetaBinomial(double mu,
                    double sigma,
                    int bd)

Method Detail

density

public static final double density(double x,
                                   double mu,
                                   double sigma,
                                   double bd,
                                   boolean give_log)

Density

Parameters:

x - MUST be an integer!

mu - MUST be between 0 and 1

sigma - MUST be > 0

bd - MUST be an integer!

give_log -

Returns:

density

cumulative

public static final double cumulative(double q,
                                      double mu,
                                      double sigma,
                                      double bd,
                                      boolean lower_tail,
                                      boolean log_p)

Cumulative. Computed by manual summation. SLOW!

Parameters:

q - MUST be an integer!

mu - MUST be between 0 and 1

sigma - MUST be > 0

bd - MUST be an integer!

lower_tail -

log_p -

Returns:

cumulative

quantile

public static final double quantile(double p,
                                    double mu,
                                    double sigma,
                                    double bd,
                                    boolean lower_tail,
                                    boolean log_p)

Quantile. Computed by manual density check. SLOW!

Parameters:

p - MUST be between 0 and 1

mu - MUST be between 0 and 1

sigma - MUST be > 0

bd - MUST be an integer!

lower_tail -

log_p -

Returns:

quantile

random

public static final double random(double mu,
                                  double sigma,
                                  double bd,
                                  RandomEngine random)

Random variate

Parameters:

mu - MUST be between 0 and 1

sigma - MUST be > 0

bd - MUST be an integer!

random -

Returns:

random variate

random

public static final double[] random(int n,
                                    double mu,
                                    double sigma,
                                    double bd,
                                    RandomEngine random)

density

public double density(double x,
                      boolean log)

Specified by:

density in class GenericDistribution

cumulative

public double cumulative(double p,
                         boolean lower_tail,
                         boolean log_p)

Specified by:

cumulative in class GenericDistribution

quantile

public double quantile(double q,
                       boolean lower_tail,
                       boolean log_p)

Specified by:

quantile in class GenericDistribution

random

public double random()

Specified by:

random in class GenericDistribution