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# Class JSci.maths.statistics.ChiSqrDistribution

    java.lang.Object
       |
       +----JSci.maths.statistics.ProbabilityDistribution
               |
               +----JSci.maths.statistics.ChiSqrDistribution

public final class ChiSqrDistribution
extends ProbabilityDistribution

The ChiSqrDistribution class provides an object for encapsulating chi-squared distributions.

##

ChiSqrDistribution(double)
  Constructs a chi-squared distribution.

##

cumulative(double)
  Cumulative chi-squared distribution function.
getDegreesOfFreedom()
  Returns the degrees of freedom.
inverse(double)
  Inverse of the cumulative chi-squared distribution function.
probability(double)
  Probability density function of a chi-squared distribution.

##

ChiSqrDistribution

     public ChiSqrDistribution(double dgr)

  Constructs a chi-squared distribution.

  Parameters:
    dgr - degrees of freedom

##

getDegreesOfFreedom

     public double getDegreesOfFreedom()

  Returns the degrees of freedom.

probability

     public double probability(double X)

  Probability density function of a chi-squared distribution.

  Returns:
    the probability that a stochastic variable x has the value X, i.e. P(x=X)
  Overrides:
    probability in class ProbabilityDistribution

cumulative

     public double cumulative(double X)

  Cumulative chi-squared distribution function.

  Returns:
    the probability that a stochastic variable x is less then X, i.e. P(x<X)
  Overrides:
    cumulative in class ProbabilityDistribution

inverse

     public double inverse(double probability)

  Inverse of the cumulative chi-squared distribution function.

  Returns:
    the value X for which P(x<X)
  Overrides:
    inverse in class ProbabilityDistribution

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