number of events each of which provides an amount of rainfall which has an exponential distribution. Thompson applied the same model to monthly total rainfalls. There has been applications to insurance claims and x-ray computed tomography. See also Compound Poisson process Hermite distribution Negative binomial distribution Geometric distribution Geometric Poisson distribution Gamma distribution Poisson distribution Zero-inflated model References Discrete distributions Poisson distribution Infinitely divisible probability distributions Compound probability distributions