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Title of Journal: Ann Inst Stat Math

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Abbravation: Annals of the Institute of Statistical Mathematics

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Springer-Verlag

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10.1016/0955-3886(93)90047-X

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1572-9052

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Limiting size index distributions for ballbin mod

Authors: Satoshi Chida Naoto Miyoshi
Publish Date: 2010/02/05
Volume: 63, Issue: 4, Pages: 745-768
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Abstract

We consider a random ballbin model where balls are thrown randomly and sequentially into a set of bins The frequency of choices of bins follows the Zipftype powerlaw distribution that is the probability with which a ball enters the ith most popular bin is asymptotically proportional to 1/i α α  0 In this model we derive the limiting size index distributions to which the empirical distributions of size indices converge almost surely where the size index of degree k at time t represents the number of bins containing exactly k balls at t While earlier studies have only treated the case where the power α of the Zipftype distribution is greater than unity we here consider the case of α ≤ 1 as well as α 1 We first investigate the limiting size index distributions for the independent throw models and then extend the derived results to a case where bins are chosen dependently Simulation experiments demonstrate not only that our analysis is valid but also that the derived limiting distributions well approximate the empirical size index distributions in a relatively short period

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