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Asymptotic behavior of Bayesian nonparametric procedures

Xing, Yang (2009). Asymptotic behavior of Bayesian nonparametric procedures. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2009:35
ISBN 978-91-86195-82-3
[Doctoral thesis]

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Asymptotics plays a crucial role in statistics. The theory of asymptotic consistency of Bayesian nonparametric procedures has been developed by many authors, including Schwartz (1965), Barron, Schervish and Wasserman (1999), Ghosal, Ghosh and Ramamoorthi (1999), Ghosal, Ghosh and van der Vaart (2000), Shen and Wasserman (2001), Walker and Hjort (2001), Walker (2004), Ghosal and van der Vaart (2007) and Walker, Lijoi and Prunster (2007). This theory is mainly based on existence of uniformly exponentially consistent tests, computation of a metric entropy and measure of a prior concentration around the true value of parameter. However, both the test condition and the metric entropy condition depend on models but not on prior distributions. Because a posterior distribution depends on the complexity of the model only through its prior distribution, it is therefore natural to explore appropriate conditions which incorporate prior distributions. In this thesis we introduce the Hausdorff entropy and an integration condition, both of which incorporate prior distributions and moreover are weaker than the metric entropy condition and the test condition, respectively. Furthermore, we provide an improved method to measure the prior concentration. By means of these new quantities, we derive several types of general posterior consistency theorems and general posterior convergence rate theorems for i.i.d. and non-i.i.d. models, which lead to improvements in a number of currently known theorems and their applications. We also study rate adaptation for density estimation within the Bayesian framework and particularly obtain that the Bayesian procedure with hierarchical prior distributions for log spline densities and a finite number of models achieves the optimal minimax rate when the true density is Hölder-continuous. This result disconfirms a conjecture given by Ghosal, Lember and van der Vaart (2003). Finally, we find a new both necessary and sufficient condition on Bayesian exponential consistency for prior distributions with the Kullback-Leibler support property.

Authors/Creators:Xing, Yang
Title:Asymptotic behavior of Bayesian nonparametric procedures
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2009
Number of Pages:18
ALL1.Xing, Y. (2008). Convergence rates of posterior distributions for observations without the iid structure, available at www.arxiv.org: 0811.4677, Submitted. 2.Xing, Y. (2008). Convergence rates of nonparametric posterior distributions, available at www.arxiv.org: 0804.2733, Submitted. 3.Xing, Y. On Adaptive Bayesian Inference, Electronic J. Statist. 2 (2008), 848-862. 4.Xing, Y and Ranneby, B. Sufficient conditions for Bayesian consistency, J. Statist. Plann. Inference. 139 (2009), 2479-2489. 5.Xing, Y and Ranneby, B. (2008). Both necessary and sufficient conditions for Bayesian exponential consistency, available at www.arxiv.org: 0812.1084, Submitted. 6.Xing, Y and Ranneby, B. (2008). On Bayesian consistency, Submitted.
Place of Publication:Umeå
Publisher:Department of Forest Economics, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-86195-82-3
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:statistical methods, mathematical models, adaptation, consistancy, density, sieving
Keywords:adaptation, consistency, density function, Hausdorff entropy, Hellinger metric, Kullback-Leibler divergence, log spline density, Markov chain, nonparametrics, posterior distribution, rate of convergence, sieve
Permanent URL:
ID Code:1957
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Economics
Deposited By: Yang Xing
Deposited On:20 May 2009 00:00
Metadata Last Modified:11 Jun 2015 08:53

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