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2015 Stein's method of exchangeable pairs for the Beta distribution and generalizations
Christian Döbler
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Electron. J. Probab. 20: 1-34 (2015). DOI: 10.1214/EJP.v20-3933


We propose a new version of Stein's method of exchangeable pairs, which, given a suitable exchangeable pair $(W,W')$ of real-valued random variables, suggests the approximation of the law of $W$ by a suitable absolutely continuous distribution. This distribution is characterized by a first order linear differential Stein operator, whose coefficients $\gamma$ and $\eta$ are motivated by two regression properties satisfied by the pair $(W,W')$. Furthermore, the general theory of Stein's method for such an absolutely continuous distribution is developed and a general characterization result as well as general bounds on the solution to the Stein equation are given. This abstract approach is a certain extension of the theory developed in previous works, which only consider the framework of the density approach, i.e. $\eta\equiv1$. As an illustration of our technique we prove a general plug-in result, which bounds a certain distance of the distribution of a given random variable $W$ to a Beta distribution in terms of a given exchangeable pair $(W,W')$ and provide new bounds on the solution to the Stein equation for the Beta distribution, which complement the existing bounds from previous works. The abstract plug-in result is then applied to derive bounds of order $n^{-1}$ for the distance between the distribution of the relative number of drawn red balls after $n$ drawings in a Pólya urn model and the limiting Beta distribution measured by a certain class of smooth test functions.


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Christian Döbler. "Stein's method of exchangeable pairs for the Beta distribution and generalizations." Electron. J. Probab. 20 1 - 34, 2015.


Accepted: 19 October 2015; Published: 2015
First available in Project Euclid: 4 June 2016

zbMATH: 1328.60064
MathSciNet: MR3418541
Digital Object Identifier: 10.1214/EJP.v20-3933

Primary: 60F05
Secondary: 60E99


Vol.20 • 2015
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