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Quantile Pyramids for Bayesian Nonparametrics
| Content Provider | Semantic Scholar |
|---|---|
| Author | Walker, Stephen G. |
| Copyright Year | 2009 |
| Abstract | Pólya trees fix partitions and use random probabilities in order to construct random probability measures. With quantile pyramids we instead fix probabilities and use random partitions. For nonparametric Bayesian inference we use a prior which supports piecewise linear quantile functions, based on the need to work with a finite set of partitions, yet we show that the limiting version of the prior exists. We also discuss and investigate an alternative model based on the socalled substitute likelihood. Both approaches factorize in a convenient way leading to relatively straightforward analysis via MCMC, since analytic summaries of posterior distributions are too complicated. We give conditions securing the existence of an absolute continuous quantile process, and discuss consistency and approximate normality for the sequence of posterior distributions. Illustrations are included. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/0902.4410v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Approximation algorithm Bayesian network Inference Markov chain Monte Carlo Normality Unit Piecewise linear continuation Probability Pólya enumeration theorem Quantile Trees (plant) |
| Content Type | Text |
| Resource Type | Article |
