org.jscience.mathematics.statistics
Class RandomVariable

java.lang.Object
  org.jscience.mathematics.statistics.RandomVariable

All Implemented Interfaces:

Named

public class RandomVariable
extends java.lang.Object
implements Named

This class models a random variable in terms of a distribution and an interval dataset. The dataset holds a random sample from the distribution.

Constructor Summary

RandomVariable()
This default constructor creates a new random variable with a normal distribution and with the default name "X".

RandomVariable(Distribution d)
This special constructor creates a new random variable with a specified probability distribution and the default name "X".

RandomVariable(Distribution d, java.lang.String n)
This general constructor creates a new random variable with a specified probability distribution and name.

Method Summary

Distribution	getDistribution() This method gets the probability distribution.
IntervalData	getIntervalData() Get the data distribution.
java.lang.String	getName() This method gets the name of the random variable.
double	getValue() This method gets the current value of the random variable.
void	reset() This method resets the data distribution.
void	sample() This method simulates a value of the probability distribution and assigns the value to the data distribution.
void	setDistribution(Distribution d) This method assigns the probability distribution and create a corresponding interval data distribution.
void	setName(java.lang.String n) This method assign a name to the random variable.
void	setValue(double x) This method assigns a value to the random variable.
double	simulate() This method simulates a value of the probability distribution, assigns the value to the data distribution, and returns the value.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomVariable

public RandomVariable(Distribution d,
                      java.lang.String n)

This general constructor creates a new random variable with a specified probability distribution and name.

Parameters:

d - the probability distribution

n - the name of the variable

RandomVariable

public RandomVariable(Distribution d)

This special constructor creates a new random variable with a specified probability distribution and the default name "X".

Parameters:

d - the probability distribution

RandomVariable

public RandomVariable()

This default constructor creates a new random variable with a normal distribution and with the default name "X".

Method Detail

setDistribution

public void setDistribution(Distribution d)

This method assigns the probability distribution and create a corresponding interval data distribution.

Parameters:

d - the probability distribution

getDistribution

public Distribution getDistribution()

This method gets the probability distribution.

Returns:

the probability distribution

getIntervalData

public IntervalData getIntervalData()

Get the data distribution.

Returns:

the interval data distribution

setValue

public void setValue(double x)

This method assigns a value to the random variable.

Parameters:

x - DOCUMENT ME!

getValue

public double getValue()

This method gets the current value of the random variable.

Returns:

the current value of the random variable

sample

public void sample()

This method simulates a value of the probability distribution and assigns the value to the data distribution.

simulate

public double simulate()

This method simulates a value of the probability distribution, assigns the value to the data distribution, and returns the value.

Returns:

a simulated value from the distribution

reset

public void reset()

This method resets the data distribution.

getName

public java.lang.String getName()

This method gets the name of the random variable.

Specified by:

getName in interface Named

Returns:

the name of the variable

setName

public void setName(java.lang.String n)

This method assign a name to the random variable.

Parameters:

n - the name of the random variable