Poisson Distribution

Distributions relating to the Poisson equation

dpois(k, λ) Returns the probability density for value k.

ppois(k, λ) Returns the cumulative probability distribution for value k.

qpois(p, λ) Returns inverse cumulative probability distribution for probability p.

rpois(m, λ) Returns a vector of m random numbers having the Poisson distribution.

Arguments:

• k is an integer greater than or equal to 0. To allow integration and other operations over this argument, values outside of the stated range are allowed, but they produce a 0 result.
• λ is a real mean, greater than 0.
• p is an real probability between 0 and 1.
• m is an integer greater than 0.

Notes:

• For definitions of the functions, and information on generating random numbers, see the Density and Distribution definitions.