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java.lang.Objectorg.apache.commons.math.distribution.AbstractDistribution
org.apache.commons.math.distribution.AbstractContinuousDistribution
org.apache.commons.math.distribution.WeibullDistributionImpl
Default implementation of
WeibullDistribution.
| Constructor Summary | |
WeibullDistributionImpl(double alpha,
double beta)
Creates weibull distribution with the given shape and scale and a location equal to zero. |
|
| Method Summary | |
double |
cumulativeProbability(double x)
For this disbution, X, this method returns P(X < x). |
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. |
double |
getScale()
Access the scale parameter. |
double |
getShape()
Access the shape parameter. |
double |
inverseCumulativeProbability(double p)
For this distribution, X, this method returns the critical point x, such that P(X < x) = p. |
void |
setScale(double beta)
Modify the scale parameter. |
void |
setShape(double alpha)
Modify the shape parameter. |
| Methods inherited from class org.apache.commons.math.distribution.AbstractDistribution |
cumulativeProbability |
| 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.Distribution |
cumulativeProbability |
| Constructor Detail |
public WeibullDistributionImpl(double alpha,
double beta)
alpha - the shape parameter.beta - the scale parameter.| Method Detail |
public double cumulativeProbability(double x)
x).
cumulativeProbability in interface Distributionx - the value at which the CDF is evaluated.
x.public double getShape()
getShape in interface WeibullDistributionpublic double getScale()
getScale in interface WeibullDistributionpublic double inverseCumulativeProbability(double p)
p.
Returns Double.NEGATIVE_INFINITY for p=0 and
Double.POSITIVE_INFINITY for p=1.
inverseCumulativeProbability in interface ContinuousDistributioninverseCumulativeProbability in class AbstractContinuousDistributionp - the desired probability
p
IllegalArgumentException - if p is not a valid
probability.public void setShape(double alpha)
setShape in interface WeibullDistributionalpha - the new shape parameter value.public void setScale(double beta)
setScale in interface WeibullDistributionbeta - the new scale parameter value.protected double getDomainLowerBound(double p)
p, used to
bracket a CDF root. This method is used by
inverseCumulativeProbability(double) to find critical values.
getDomainLowerBound in class AbstractContinuousDistributionp - the desired probability for the critical value
pprotected double getDomainUpperBound(double p)
p, used to
bracket a CDF root. This method is used by
inverseCumulativeProbability(double) to find critical values.
getDomainUpperBound in class AbstractContinuousDistributionp - the desired probability for the critical value
pprotected double getInitialDomain(double p)
p, used to
bracket a CDF root. This method is used by
inverseCumulativeProbability(double) to find critical values.
getInitialDomain in class AbstractContinuousDistributionp - the desired probability for the critical value
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