javanpst.distributions.common.discrete

Class BinomialDistribution

java.lang.Object

javanpst.distributions.common.discrete.BinomialDistribution

All Implemented Interfaces:

Distribution

public final class BinomialDistribution
extends java.lang.Object
implements Distribution

A binomial distribution, with parameters N and P

Constructor Summary

Constructors

Constructor and Description
BinomialDistribution() Default builder.
BinomialDistribution(BinomialDistribution old) Copy constructor Creates a copy of a given binomial distribution
BinomialDistribution(int n, double p) Builder.

Method Summary

Modifier and Type	Method and Description
double	computeCumulativeProbability(double value) Computes cumulative probability at a given point of the distribution.
double	computeProbability(double value) Computes mass probability at a given point of the binomial distribution.
int	getLesserCumulativeProbability(double limit) Computes the greatest integer whose cumulative probability is lower than a given value
int	getN() Gets the N parameter value
double	getP() Gets the P parameter value
int	getUpperCumulativeProbability(double limit) Computes the lowest integer whose cumulative probability is greater than a given value
void	setN(int value) Sets the N parameter.
void	setP(double value) Sets the P parameter.
java.lang.String	toString() To String method.

Methods inherited from class java.lang.Object

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

Constructor Detail

BinomialDistribution

public BinomialDistribution()

Default builder. Creates a binomial distribution with parameters N=1, P=0.0

BinomialDistribution

public BinomialDistribution(int n,
                            double p)

Builder. Creates a binomial distribution with parameters N and P

Parameters:

n - N parameter

p - P parameter

BinomialDistribution

public BinomialDistribution(BinomialDistribution old)

Copy constructor Creates a copy of a given binomial distribution

Parameters:

old - Binomial distribution to copy

Method Detail

setP

public void setP(double value)

Sets the P parameter. Only works if P is in [0.0,1.0]

Parameters:

value - P parameter value

getP

public double getP()

Gets the P parameter value

Returns:

value of P

setN

public void setN(int value)

Sets the N parameter. Only works if N is greater than 0

Parameters:

value - N parameter value

getN

public int getN()

Gets the N parameter value

Returns:

value of N

computeProbability

public double computeProbability(double value)

Computes mass probability at a given point of the binomial distribution. Value given is converted to integer before computing probability.

Specified by:

computeProbability in interface Distribution

Parameters:

value - point selected

Returns:

mass probability at 'value'

computeCumulativeProbability

public double computeCumulativeProbability(double value)

Computes cumulative probability at a given point of the distribution. Value given is converted to integer before computing probability.

Specified by:

computeCumulativeProbability in interface Distribution

Parameters:

value - point selected

Returns:

cumulative probability at 'value'

getLesserCumulativeProbability

public int getLesserCumulativeProbability(double limit)

Computes the greatest integer whose cumulative probability is lower than a given value

Parameters:

limit - Maximum probability allowed

Returns:

greatest integer found. -1 if there is not any.

getUpperCumulativeProbability

public int getUpperCumulativeProbability(double limit)

Computes the lowest integer whose cumulative probability is greater than a given value

Parameters:

limit - Minimum probability allowed

Returns:

lowest integer found. -1 if there is not any.

toString

public java.lang.String toString()

To String method.

Overrides:

toString in class java.lang.Object

Returns:

string representation of the distribution