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Generalized Coupon Collection: The Superlinear Case

Published online by Cambridge University Press:  14 July 2016

R. T. Smythe*
Affiliation:
Oregon State University
*
∗ Postal address: Department of Statistics, Oregon State University, Corvallis, OR 97331-4606, USA. Email address: smythe@science.oregonstate.edu
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Abstract

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We consider a generalized form of the coupon collection problem in which a random number, S, of balls is drawn at each stage from an urn initially containing n white balls (coupons). Each white ball drawn is colored red and returned to the urn; red balls drawn are simply returned to the urn. The question considered is then: how many white balls (uncollected coupons) remain in the urn after the k n draws? Our analysis is asymptotic as n → ∞. We concentrate on the case when k n draws are made, where k n / n → ∞ (the superlinear case), although we sketch known results for other ranges of k n . A Gaussian limit is obtained via a martingale representation for the lower superlinear range, and a Poisson limit is derived for the upper boundary of this range via the Chen-Stein approximation.

Information

Type
Research Article
Copyright
Copyright © Applied Probability Trust 2011