org.statcato.statistics
Class ExponentialProbabilityDistribution

java.lang.Object
  extended by org.statcato.statistics.ProbabilityDistribution
      extended by org.statcato.statistics.ExponentialProbabilityDistribution

public class ExponentialProbabilityDistribution
extends ProbabilityDistribution

Exponential probability distribution class. A continuous probability distribution defined by the exponential function.

Since:
1.0
Version:
%I%, %G%
Author:
Margaret Yau

Constructor Summary
ExponentialProbabilityDistribution(double lambda)
          Constructor, given the rate parameter.
 
Method Summary
 double cumulativeProbability(double x)
          Returns the cumulative probabililty up to x.
 double density(double x)
          Returns the density of the distribution at x.
 double inverseCumulativeProbability(double area)
          Returns the inverse cumulative probability.
 
Methods inherited from class org.statcato.statistics.ProbabilityDistribution
inverseCumulativeProbability
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExponentialProbabilityDistribution

public ExponentialProbabilityDistribution(double lambda)
Constructor, given the rate parameter.

Parameters:
rate - parameter
Method Detail

density

public double density(double x)
Returns the density of the distribution at x.

Specified by:
density in class ProbabilityDistribution
Parameters:
x -
Returns:
probability density at x

cumulativeProbability

public double cumulativeProbability(double x)
Returns the cumulative probabililty up to x.

Specified by:
cumulativeProbability in class ProbabilityDistribution
Parameters:
x -
Returns:
cumulative probability P(<=x)

inverseCumulativeProbability

public double inverseCumulativeProbability(double area)
Returns the inverse cumulative probability.

Parameters:
area - cumulative probability
Returns:
inverse cumulative probability