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Asymptotic behavior of the number of distinct values in a sample from the geometric stick-breaking process
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Asymptotic behavior of the number of distinct values in a sample from the geometric stick-breaking process
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Journal Article
Asymptotic behavior of the number of distinct values in a sample from the geometric stick-breaking process
2022
Overview
Discrete random probability measures are a key ingredient of Bayesian nonparametric inference. A sample generates ties with positive probability and a fundamental object of both theoretical and applied interest is the corresponding number of distinct values. The growth rate can be determined from the rate of decay of the small frequencies implying that, when the decreasingly ordered frequencies admit a tractable form, the asymptotics of the number of distinct values can be conveniently assessed. We focus on the geometric stick-breaking process and we investigate the effect of the distribution for the success probability on the asymptotic behavior of the number of distinct values. A whole range of logarithmic behaviors are obtained by appropriately tuning the prior. A two-term expansion is also derived and illustrated in a comparison with a larger family of discrete random probability measures having an additional parameter given by the scale of the negative binomial distribution.
Publisher
Springer Japan,Springer Nature B.V
