Poisson probability mass function

Evaluated in log space so large k does not overflow.

Usage

PoisPmf(k, a)

Arguments

k

event count, >= 0.

a

expected count, >= 0.

Value

list(k, a, probability).

References

Morin, D. J. (2016). Probability: For the Enthusiastic Beginner. Createspace. Eq (4.40).

Examples

PoisPmf(3, 2)$probability
#> [1] 0.180447