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Greenwood, M. and Yule, G.U. (1920) An Inquiry into the Nature of Frequency Distributions of Multiple Happenings, with Particular Reference to the Occurrence of Multiple Attacks of Disease or Repeated Accidents. Journal of the Royal Statistical Society A, 83, 255-279.
https://doi.org/10.2307/2341080

has been cited by the following article:

• TITLE: The Conditional Poisson Process and the Erlang and Negative Binomial Distributions

  AUTHORS: Anurag Agarwal, Peter Bajorski, David L. Farnsworth, James E. Marengo, Wei Qian

  KEYWORDS: Conditional Distribution, Hierarchical Model, Mixture Distribution, Poisson Process, Stochastic Process

  JOURNAL NAME: Open Journal of Statistics, Vol.7 No.1, February 9, 2017

  ABSTRACT: It is a well known fact that for the hierarchical model of a Poisson random variable Ywhose mean has an Erlang distribution, the unconditional distribution of Y is negative binomial. However, the proofs in the literature [1] [2] provide no intuitive understanding as to why this result should be true. It is the purpose of this manuscript to give a new proof of this result which provides such an understanding. The memoryless property of the exponential distribution allows one to conclude that the events in two independent Poisson processes may be regarded as Bernoulli trials, and this fact is used to achieve the research purpose. Another goal of this manuscript is to give another proof of this last fact which does not rely on the memoryless property.