org.statcato.statistics
Class ChiSquareProbabilityDistribution

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

public class ChiSquareProbabilityDistribution
extends ProbabilityDistribution

Chi Square probability distribution class.

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

Constructor Summary
ChiSquareProbabilityDistribution(double v)
          Constructor, given the degrees of freedom
 
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

ChiSquareProbabilityDistribution

public ChiSquareProbabilityDistribution(double v)
Constructor, given the degrees of freedom

Parameters:
v - degrees of freedom
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