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java.lang.Objectorg.apache.commons.math.distribution.AbstractDistribution
org.apache.commons.math.distribution.AbstractIntegerDistribution
org.apache.commons.math.distribution.BinomialDistributionImpl
public class BinomialDistributionImpl
The default implementation of BinomialDistribution
.
Constructor Summary | |
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BinomialDistributionImpl(int trials,
double p)
Create a binomial distribution with the given number of trials and probability of success. |
Method Summary | |
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double |
cumulativeProbability(int x)
For this distribution, X, this method returns P(X ≤ x). |
int |
getNumberOfTrials()
Access the number of trials for this distribution. |
double |
getProbabilityOfSuccess()
Access the probability of success for this distribution. |
int |
inverseCumulativeProbability(double p)
For this distribution, X, this method returns the largest x, such that P(X ≤ x) ≤ p . |
double |
probability(int x)
For this disbution, X, this method returns P(X = x). |
void |
setNumberOfTrials(int trials)
Change the number of trials for this distribution. |
void |
setProbabilityOfSuccess(double p)
Change the probability of success for this distribution. |
Methods inherited from class org.apache.commons.math.distribution.AbstractIntegerDistribution |
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cumulativeProbability, cumulativeProbability, probability |
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.IntegerDistribution |
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cumulativeProbability |
Methods inherited from interface org.apache.commons.math.distribution.DiscreteDistribution |
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probability |
Methods inherited from interface org.apache.commons.math.distribution.Distribution |
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cumulativeProbability, cumulativeProbability |
Constructor Detail |
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public BinomialDistributionImpl(int trials, double p)
trials
- the number of trials.p
- the probability of success.Method Detail |
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public int getNumberOfTrials()
getNumberOfTrials
in interface BinomialDistribution
public double getProbabilityOfSuccess()
getProbabilityOfSuccess
in interface BinomialDistribution
public void setNumberOfTrials(int trials)
setNumberOfTrials
in interface BinomialDistribution
trials
- the new number of trials.
java.lang.IllegalArgumentException
- if trials
is not a valid
number of trials.public void setProbabilityOfSuccess(double p)
setProbabilityOfSuccess
in interface BinomialDistribution
p
- the new probability of success.
java.lang.IllegalArgumentException
- if p
is not a valid
probability.public double cumulativeProbability(int x) throws MathException
cumulativeProbability
in interface IntegerDistribution
cumulativeProbability
in class AbstractIntegerDistribution
x
- the value at which the PDF is evaluated.
MathException
- if the cumulative probability can not be
computed due to convergence or other numerical errors.public double probability(int x)
probability
in interface IntegerDistribution
x
- the value at which the PMF is evaluated.
public int inverseCumulativeProbability(double p) throws MathException
p
.
Returns -1
for p=0 and Integer.MAX_VALUE
for
p=1.
inverseCumulativeProbability
in interface IntegerDistribution
inverseCumulativeProbability
in class AbstractIntegerDistribution
p
- the desired probability
MathException
- if the inverse cumulative probability can not be
computed due to convergence or other numerical errors.
java.lang.IllegalArgumentException
- if p < 0 or p > 1
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