Skip to main content

Poisson is a discrete probability distribution in statistics that is popular in probabilistic modeling (including in Bayesian statistics) as well as business forecasting.

Poisson is a discrete probability distribution in statistics that is popular in probabilistic modeling (including in Bayesian statistics) as well as business forecasting. It is given by the formula for a random variable $X$:

$$P(X = k) = {{\lambda^{k}e^{-\lambda}}\over {k!}}$$