Poisson Distribution

The Poisson random variable counts the number of successes in $n$ independent Bernoulli trials in the limit as $n\to \infty$ and $p\to 0$ where the probability of success in each trial is $p$ and $np=\lambda \ge 0$ is a constant. It can be used to approximate the Binomial random variable or in its own right to count the number of events that occur in the interval $\left[0,t\right]$ for a process satisfying certain "sparsity" constraints. The functions are:

Implementation: scipy.stats.poisson