Data-Driven Efficient Estimation of the Spectral Density
谱密度的数据驱动有效估计AI 解读 ↓
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谱密度的数据驱动有效估计AI 解读 ↓
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A nonparametric data-driven spectral density estimator is suggested for a class of processes with the exponentially decaying autocovariance function. This particular class is motivated by causal ARMA processes. The estimator is asymptotically efficient; that is, its mean integrated squared error converges with optimal minimax constant and rate as the sample size increases. The article also presents a Monte Carlo study of the estimator for the case of small sample sizes and an illustrative example of its application in the spectral domain analysis of insulin secretion data. The estimator is both simple and reliable, and does not require human supervision; thus it can be recommended to a practitioner with little or even no experience in spectral analysis of time series.