Описание тега poisson
The Poisson distribution is a statistical discrete distribution for describing events occurring at random intervals. It is defined on the non-negative integers that has the property in which the mean is equal to the variance.
The Poisson probability distribution is used to model the probability of a number of events occurring during a specified time interval.
The Poisson distribution is characterized by an expected arrival rate, usually designated by the Greek lower-case letter lambda.
A discrete random variable X has a Poisson distribution indexed by a parameter λ if it has probability mass function as following:
Useful links:
https://en.wikipedia.org/wiki/Poisson_distribution.
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