Adaptive Bayesian Time–Frequency Analysis of Multivariate Time Series
多元时间序列的自适应贝叶斯时频分析AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究多元时间序列的时变谱,并通过未知分区处理突变和缓变,涉及时间序列与结构变化。
多元时间序列的自适应贝叶斯时频分析AI 解读 ↓
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This article introduces a nonparametric approach to multivariate time-varying power spectrum analysis. The procedure adaptively partitions a time series into an unknown number of approximately stationary segments, where some spectral components may remain unchanged across segments, allowing components to evolve differently over time. Local spectra within segments are fit through Whittle likelihood based penalized spline models of modified Cholesky components, which provide flexible nonparametric estimates that preserve positive definite structures of spectral matrices. The approach is formulated in a Bayesian framework, in which the number and location of partitions are random, and relies on reversible jump Markov chain and Hamiltonian Monte Carlo methods that can adapt to the unknown number of segments and parameters. By averaging over the distribution of partitions, the approach can approximate both abrupt and slow-varying changes in spectral matrices. Empirical performance is evaluated in simulation studies and illustrated through analyses of electroencephalography during sleep and of the El Niño-Southern Oscillation.