Class JSci.maths.statistics.GammaDistribution
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Class JSci.maths.statistics.GammaDistribution
java.lang.Object
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+----JSci.maths.statistics.ProbabilityDistribution
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+----JSci.maths.statistics.GammaDistribution
- public final class GammaDistribution
- extends ProbabilityDistribution
The GammaDistribution class provides an object for encapsulating gamma distributions.
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GammaDistribution(double)
- Constructs a gamma distribution.
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cumulative(double)
- Cumulative gamma distribution function.
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getShapeParameter()
- Returns the shape parameter.
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inverse(double)
- Inverse of the cumulative gamma distribution function.
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probability(double)
- Probability density function of a gamma distribution.
GammaDistribution
public GammaDistribution(double shape)
- Constructs a gamma distribution.
- Parameters:
- shape - the shape parameter
getShapeParameter
public double getShapeParameter()
- Returns the shape parameter.
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
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
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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