To find out, we can compare these counts to a Poisson distribution with an average value of 2. In the graph above, the blue bars represent the observed instances of 0,1,2,3.. mass shootings in a year.

An extension of MacArthur's "broken stick" model is proposed to explain why species abundances should be lognormally distributed. A method of fitting the compound Poisson lognormal distribution by ...

Quasi-Likelihood Functions For binomial and Poisson distributions, the scale parameter has a value of 1. The variance of Y is for the binomial distribution and for the Poisson distribution.

Scott M. Lesch, Daniel R. Jeske, Some Suggestions for Teaching About Normal Approximations to Poisson and Binomial Distribution Functions, The American Statistician, Vol. 63, No. 3 (AUGUST 2009), pp.