poisson

poisson, function

def pure poisson(lambda: number): ranvar

Returns the Poisson distribution of mean lambda.

• lambda: the mean of the distribution (non-negative).

Example

p = poisson(3)

show summary "Poisson(3)" with
  mean(p) as "Mean"
  variance(p) as "Variance"

This outputs the following summary:

Errors

Fails if lambda is greater than 1000000 (one million).

See also

• mean
• variance