AdaptSPEC: Adaptive Spectral Estimation for Nonstationary Time Series
AdaptSPEC:非平稳时间序列的自适应谱估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究非平稳时间序列的局部谱,并估计未知数量及长度的时间分段,直接涉及时间序列与结构变化。
AdaptSPEC:非平稳时间序列的自适应谱估计AI 解读 ↓
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We propose a method for analyzing possibly nonstationary time series by adaptively dividing the time series into an unknown but finite number of segments and estimating the corresponding local spectra by smoothing splines. The model is formulated in a Bayesian framework, and the estimation relies on reversible jump Markov chain Monte Carlo (RJMCMC) methods. For a given segmentation of the time series, the likelihood function is approximated via a product of local Whittle likelihoods. Thus, no parametric assumption is made about the process underlying the time series. The number and lengths of the segments are assumed unknown and may change from one MCMC iteration to another. The frequentist properties of the method are investigated by simulation, and applications to electroencephalogram and the El Niño Southern Oscillation phenomenon are described in detail.