4.1 Review of Probability Computation
https://en.wikipedia.org/wiki/Compound_probability_distribution https://en.wikipedia.org/wiki/Compound_Poisson_distribution https://en.wikipedia.org/wiki/Geometric_Poisson_distribution https://en.wikipedia.org/wiki/Slash_distribution https://en.wikipedia.org/wiki/Hurdle_model https://en.wikipedia.org/wiki/Hermite_distribution https://en.wikipedia.org/wiki/Super-Poissonian_distribution