public class GammaDistribution extends Object implements ProbabilityDistribution
dgamma, pgamma, qgamma, rgamma.| Constructor and Description |
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GammaDistribution(double k,
double theta)
Construct a Gamma distribution.
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| Modifier and Type | Method and Description |
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double |
cdf(double x)
Gets the cumulative probability F(x) = Pr(X ≤ x).
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double |
density(double x)
The density function, which, if exists, is the derivative of F.
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double |
entropy()
Deprecated.
Not supported yet.
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double |
kurtosis()
Gets the excess kurtosis of this distribution.
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double |
mean()
Gets the mean of this distribution.
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double |
median()
Gets the median of this distribution.
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double |
moment(double t)
The moment generating function is the expected value of etX.
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double |
quantile(double u)
Gets the quantile, the inverse of the cumulative distribution function.
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double |
skew()
Gets the skewness of this distribution.
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double |
variance()
Gets the variance of this distribution.
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public GammaDistribution(double k,
double theta)
k - the shape parametertheta - the scale parameterpublic double mean()
ProbabilityDistributionmean in interface ProbabilityDistributionpublic double median()
ProbabilityDistributionmedian in interface ProbabilityDistributionpublic double variance()
ProbabilityDistributionvariance in interface ProbabilityDistributionpublic double skew()
ProbabilityDistributionskew in interface ProbabilityDistributionpublic double kurtosis()
ProbabilityDistributionkurtosis in interface ProbabilityDistribution@Deprecated public double entropy()
ProbabilityDistributionentropy in interface ProbabilityDistributionpublic double cdf(double x)
ProbabilityDistributioncdf in interface ProbabilityDistributionx - xpublic double quantile(double u)
ProbabilityDistributionThis may not always exist.F-1(u) = x, such that Pr(X ≤ x) = u
quantile in interface ProbabilityDistributionu - u, a quantilepublic double density(double x)
ProbabilityDistributionf(x) = dF(X) / dxThis may not always exist. For the discrete cases, this is the probability mass function. It gives the probability that a discrete random variable is exactly equal to some value.
density in interface ProbabilityDistributionx - xpublic double moment(double t)
ProbabilityDistributionE(etX)This may not always exist.
moment in interface ProbabilityDistributiont - tCopyright © 2010-2020 NM FinTech Ltd.. All Rights Reserved.