Statistics Dictionary

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Poisson Distribution

The probability distribution of a Poisson random variable is called a Poisson distribution.

The Poisson probability distribution is defined by the following formula:

Poisson Formula. Suppose we conduct a Poisson experiment, in which the average number of successes within a given region is m. Then, the Poisson probability is:

P(x; m) = (e-m) (mx) / x!

where x is the actual number of successes that result from the experiment, and e is approximately equal to 2.71828.

See also:   Statistics Tutorial: Poisson Distribution | Poisson Calculator