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• W1538797441 abstract "In this paper, we study the problem of nonparametric adaptive estimation of the covariance function of a stationary Gaussian process. For this purpose, we consider a wavelet-based method which combines the ideas of wavelet approximation and estimation by information projection in order to warrants the positive semidefiniteness property of the solution. The spectral density of the process is estimated by projecting the wavelet thresholding expansion of the periodogram onto a family of exponential functions. This ensures that the spectral density estimator is a strictly positive function. Then, by Bochner theorem, we obtain a semidefinite positive estimator of the covariance function. The theoretical behavior of the estimator is established in terms of rate of convergence of the Kullback-Leibler discrepancy over Besov classes. We also show the excellent practical performance of the estimator in some numerical experiments." @default.
• W1538797441 created "2016-06-24" @default.
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• W1538797441 date "2009-12-10" @default.
• W1538797441 modified "2023-10-18" @default.
• W1538797441 title "Adaptive estimation of covariance functions via wavelet thresholding and information projection" @default.
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