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Class JSci.maths.statistics.GammaDistribution 

java.lang.Object
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   +----JSci.maths.statistics.ProbabilityDistribution
           |
           +----JSci.maths.statistics.GammaDistribution
public final class GammaDistribution
extends ProbabilityDistribution
The GammaDistribution class provides an object for encapsulating gamma distributions.

Constructor Index

o GammaDistribution(double)
Constructs a gamma distribution.

Method Index

o cumulative(double)
Cumulative gamma distribution function.
o getShapeParameter()
Returns the shape parameter.
o inverse(double)
Inverse of the cumulative gamma distribution function.
o probability(double)
Probability density function of a gamma distribution.

Constructors

o GammaDistribution 
 public GammaDistribution(double shape)
Constructs a gamma distribution.

Parameters:
shape - the shape parameter

Methods

o getShapeParameter 
 public double getShapeParameter()
Returns the shape parameter.

o probability 
 public double probability(double X)
Probability density function of a gamma distribution.

Returns:
the probability that a stochastic variable x has the value X, i.e. P(x=X)
Overrides:
probability in class ProbabilityDistribution
o cumulative 
 public double cumulative(double X)
Cumulative gamma distribution function.

Returns:
the probability that a stochastic variable x is less then X, i.e. P(x<X)
Overrides:
cumulative in class ProbabilityDistribution
o inverse 
 public double inverse(double probability)
Inverse of the cumulative gamma distribution function.

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