Summary
An alternative simple derivation is given for some integral expressions for tail probabilities of the negative multinomial distribution obtained by Olkin & Sobel [3] inBiometrika. The new derivation is based on the fact that the negative multinomial distribution is a certain mixture of the multiple Poisson distribution and on a well known integral expression for the distribution function of the univariate Poisson distribution.
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Joshi, S.W. Integral expressions for tail probabilities of the negative multinomial distribution. Ann Inst Stat Math 27, 95–97 (1975). https://doi.org/10.1007/BF02504628
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DOI: https://doi.org/10.1007/BF02504628