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java.lang.Objectorg.apache.commons.math.distribution.AbstractDistribution
org.apache.commons.math.distribution.AbstractContinuousDistribution
org.apache.commons.math.distribution.NormalDistributionImpl
public class NormalDistributionImpl
Default implementation of
NormalDistribution
.
Constructor Summary | |
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NormalDistributionImpl()
Creates normal distribution with the mean equal to zero and standard deviation equal to one. |
|
NormalDistributionImpl(double mean,
double sd)
Create a normal distribution using the given mean and standard deviation. |
Method Summary | |
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double |
cumulativeProbability(double x)
For this disbution, X, this method returns P(X < x ). |
double |
getMean()
Access the mean. |
double |
getStandardDeviation()
Access the standard deviation. |
double |
inverseCumulativeProbability(double p)
For this distribution, X, this method returns the critical point x, such that P(X < x) = p . |
void |
setMean(double mean)
Modify the mean. |
void |
setStandardDeviation(double sd)
Modify the standard deviation. |
Methods inherited from class org.apache.commons.math.distribution.AbstractDistribution |
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cumulativeProbability |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.commons.math.distribution.Distribution |
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cumulativeProbability |
Constructor Detail |
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public NormalDistributionImpl(double mean, double sd)
mean
- mean for this distributionsd
- standard deviation for this distributionpublic NormalDistributionImpl()
Method Detail |
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public double getMean()
getMean
in interface NormalDistribution
public void setMean(double mean)
setMean
in interface NormalDistribution
mean
- for this distributionpublic double getStandardDeviation()
getStandardDeviation
in interface NormalDistribution
public void setStandardDeviation(double sd)
setStandardDeviation
in interface NormalDistribution
sd
- standard deviation for this distribution
java.lang.IllegalArgumentException
- if sd
is not positive.public double cumulativeProbability(double x) throws MathException
x
).
cumulativeProbability
in interface Distribution
x
- the value at which the CDF is evaluated.
x
.
MathException
- if the algorithm fails to converge.public double inverseCumulativeProbability(double p) throws MathException
p
.
Returns Double.NEGATIVE_INFINITY
for p=0 and
Double.POSITIVE_INFINITY
for p=1.
inverseCumulativeProbability
in interface ContinuousDistribution
inverseCumulativeProbability
in class AbstractContinuousDistribution
p
- the desired probability
p
MathException
- if the inverse cumulative probability can not be
computed due to convergence or other numerical errors.
java.lang.IllegalArgumentException
- if p
is not a valid
probability.
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