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java.lang.Objectorg.apache.commons.math.distribution.AbstractContinuousDistribution
org.apache.commons.math.distribution.GammaDistributionImpl
The default implementation of GammaDistribution
Constructor Summary | |
GammaDistributionImpl(double alpha,
double beta)
Create a new gamma distribution with the given alpha and beta values. |
Method Summary | |
double |
cummulativeProbability(double x)
For this disbution, X, this method returns P(X < x). |
double |
getAlpha()
Access the shape parameter, alpha |
double |
getBeta()
Access the scale parameter, beta |
protected double |
getDomainLowerBound(double p)
Access the domain value lower bound, based on p , used to
bracket a CDF root. |
protected double |
getDomainUpperBound(double p)
Access the domain value upper bound, based on p , used to
bracket a CDF root. |
protected double |
getInitialDomain(double p)
Access the initial domain value, based on p , used to
bracket a CDF root. |
void |
setAlpha(double alpha)
Modify the shape parameter, alpha. |
void |
setBeta(double beta)
Modify the scale parameter, beta. |
Methods inherited from class org.apache.commons.math.distribution.AbstractContinuousDistribution |
cummulativeProbability, inverseCummulativeProbability |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.commons.math.distribution.ContinuousDistribution |
cummulativeProbability, inverseCummulativeProbability |
Constructor Detail |
public GammaDistributionImpl(double alpha, double beta)
alpha
- the shape parameter.beta
- the scale parameter.Method Detail |
public double cummulativeProbability(double x) throws MathException
cummulativeProbability
in interface ContinuousDistribution
x
- the value at which the CDF is evaluated.
MathException
public void setAlpha(double alpha)
setAlpha
in interface GammaDistribution
alpha
- the new shape parameter.public double getAlpha()
getAlpha
in interface GammaDistribution
public void setBeta(double beta)
setBeta
in interface GammaDistribution
beta
- the new scale parameter.public double getBeta()
getBeta
in interface GammaDistribution
protected double getDomainLowerBound(double p)
p
, used to
bracket a CDF root. This method is used by
AbstractContinuousDistribution.inverseCummulativeProbability(double)
to find critical values.
getDomainLowerBound
in class AbstractContinuousDistribution
p
- the desired probability for the critical value
p
TODO: try to improve on this estimateprotected double getDomainUpperBound(double p)
p
, used to
bracket a CDF root. This method is used by
AbstractContinuousDistribution.inverseCummulativeProbability(double)
to find critical values.
getDomainUpperBound
in class AbstractContinuousDistribution
p
- the desired probability for the critical value
p
TODO: try to improve on this estimateprotected double getInitialDomain(double p)
p
, used to
bracket a CDF root. This method is used by
AbstractContinuousDistribution.inverseCummulativeProbability(double)
to find critical values.
getInitialDomain
in class AbstractContinuousDistribution
p
- the desired probability for the critical value
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