Adaptive estimation of stationary Gaussian fields - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Journal Articles Annals of Statistics Year : 2009

Adaptive estimation of stationary Gaussian fields


We study the nonparametric covariance estimation of a stationary Gaussian field X observed on a regular lattice. In the time series setting, some procedures like AIC are proved to achieve optimal model selection among autoregressive models. However, there exists no such equivalent results of adaptivity in a spatial setting. By considering collections of Gaussian Markov random fields (GMRF) as approximation sets for the distribution of X, we introduce a novel model selection procedure for spatial fields. For all neighborhoods m in a given collection M, this procedure first amounts to computing a covariance estimator of X within the GMRFs of neighborhood m. Then, it selects a neighborhood by applying a penalization strategy. The so-defined method satisfies a nonasymptotic oracle type inequality. If X is a GMRF, the procedure is also minimax adaptive to the sparsity of its neighborhood. More generally, the procedure is adaptive to the rate of approximation of the true distribution by GMRFs with growing neighborhoods.
Fichier principal
Vignette du fichier
2010-Ver-GMRF.pdf (402.64 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

inria-00353251 , version 1 (15-01-2009)
inria-00353251 , version 2 (01-09-2009)
inria-00353251 , version 3 (08-10-2010)



Nicolas Verzelen. Adaptive estimation of stationary Gaussian fields. Annals of Statistics, 2009, 38 (3), pp.36. ⟨10.1214/09-AOS751⟩. ⟨inria-00353251v3⟩
251 View
188 Download



Gmail Facebook Twitter LinkedIn More