Concentration rate and consistency of the posterior distribution for selected priors under monotonicity constraints
Salomond, Jean-Bernard (2014), Concentration rate and consistency of the posterior distribution for selected priors under monotonicity constraints, Electronic Journal of Statistics, 8, 1, p. 1380-1404. 10.1214/14-EJS929
Type
Article accepté pour publication ou publiéExternal document link
http://dx.doi.org/10.1214/14-EJS929Date
2014Journal name
Electronic Journal of StatisticsVolume
8Number
1Publisher
IMS
Pages
1380-1404
Publication identifier
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Salomond, Jean-BernardAbstract (EN)
In this paper, we consider the well known problem of estimating a density function under qualitative assumptions. More precisely, we estimate monotone non-increasing densities in a Bayesian setting and derive concentration rate for the posterior distribution for a Dirichlet process and finite mixture prior. We prove that the posterior distribution based on both priors concentrates at the rate (n/log(n))−1/3, which is the minimax rate of estimation up to a log(n) factor. We also study the behaviour of the posterior for the point-wise loss at any fixed point of the support of the density and for the sup-norm. We prove that the posterior distribution is consistent for both loss functions.Subjects / Keywords
Density estimation; Bayesian inference; concentration rateRelated items
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