| org.apache.commons.math.distribution.PoissonDistribution
All known Subclasses: org.apache.commons.math.distribution.PoissonDistributionImpl,
| PoissonDistribution | | public interface PoissonDistribution extends IntegerDistribution(Code) | | Interface representing the Poisson Distribution.
References:
version:
$Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $ |
| Method Summary | |
| public double | getMean()
Get the mean for the distribution. | | public double | normalApproximateProbability(int x)
Calculates the Poisson distribution function using a normal approximation. | | public void | setMean(double p)
Set the mean for the distribution. |
| getMean | | public double getMean()(Code) | | Get the mean for the distribution.
the mean for the distribution. |
| normalApproximateProbability | | public double normalApproximateProbability(int x) throws MathException(Code) | | Calculates the Poisson distribution function using a normal approximation.
Parameters:
x - the upper bound, inclusive the distribution function value calculated using a normal approximation
throws:
MathException - if an error occurs computing the normal approximation |
| setMean | | public void setMean(double p)(Code) | | Set the mean for the distribution.
The parameter value must be positive; otherwise an
IllegalArgument is thrown.
Parameters:
p - the mean
throws:
IllegalArgumentException - if p ≤ 0 |
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