class

Statistics::Distributions::Poisson

Inherits Statistics::Distributions::DiscreteDistribution < Statistics::Distributions::Distribution < Reference < Object

Represents a discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time or space if these events occur with a known constant mean rate and independently of the time since the last event (source: wikipedia)

Constructors

new(lambda : Float64)

Creates a Poisson distribution with expected value lambda.

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Instance methods

pmf(x)

The Probability Mass Function (PMF) of a discrete random variable.

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rand

Samples a random variable with the given distribution.

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