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- W2123934324 abstract "SUMMARY The classical method for estimating the spectral density of a multivariate time series is first to calculate the periodogram, and then to smooth it to obtain a consistent estimator. Typically, to ensure the estimate is positive definite, all the elements of the periodogram are smoothed the same way. There are, however, many situations for which different components of the spectral matrix have different degrees of smoothness. We propose a Bayesian approach that uses Markov chain Monte Carlo techniques to fit smoothing splines to each component, real and imaginary, of the Cholesky decomposition of the periodogram matrix. The spectral estimator is then obtained by reconstructing the spectral estimator from the smoothed Cholesky decomposition components. Our technique produces an automatically smoothed spectral matrix estimator along with samples from the posterior distributions of the parameters to facilitate inference." @default.
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- W2123934324 date "2007-02-28" @default.
- W2123934324 modified "2023-10-16" @default.
- W2123934324 title "Automatic estimation of multivariate spectra via smoothing splines" @default.
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- W2123934324 doi "https://doi.org/10.1093/biomet/asm022" @default.
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