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Distributions of ballot problem random variables

Published online by Cambridge University Press:  01 July 2016

Chern-Ching Chao  and
Norman C. Severo
Chern-Ching Chao*
Affiliation:
Academia Sinica
Norman C. Severo*
Affiliation:
State University of New York at Buffalo
*
∗ Postal address: Institute of Statistical Science, Academia Sinica, Taipei 11529, Taiwan, Republic of China.
∗∗ Postal address: Department of Statistics, State University of New York at Buffalo, Buffalo, NY 14214, USA.
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Abstract

Suppose that in a ballot candidate A scores a votes and candidate B scores b votes, and that all the possible voting records are equally probable. Corresponding to the first r votes, let α r and β r be the numbers of votes registered for A and B, respectively. Let p be an arbitrary positive real number. Denote by δ (a, b, p)[δ *(a, b, ρ)] the number of values of r for which the inequality , r = 1, ···, a + b, holds. Heretofore the probability distributions of δand δ* have been derived for only a restricted set of values of a, b, and ρ, although, as pointed out here, they are obtainable for all values of (a, b, ρ) by using a result of Takács (1964). In this paper we present a derivation of the distribution of δ [δ *] whose development, for any (a, b, ρ), leads to both necessary and sufficient conditions for δ [δ *] to have a discrete uniform distribution.

Keywords

DISCRETE UNIFORM DISTRIBUTIONLATTICE PATHS

Information

Type
Research Article
Information
Advances in Applied Probability , Volume 23 , Issue 3 , September 1991 , pp. 586 - 597
Copyright
Copyright © Applied Probability Trust 1991 

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Footnotes

Part of this work was done while this author was at the State University of New York at Buffalo and at the University of Kentucky.

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