Adaptive covariance estimation of locally stationary processes
局部平稳过程的自适应协方差估计AI 解读 ↓
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局部平稳过程的自适应协方差估计AI 解读 ↓
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It is shown that the covariance operator of a locally stationary process has approximate eigenvectors that are local cosine functions. We model locally stationary processes with pseudo-differential operators that are time-varying convolutions. An adaptive covariance estimation is calculated by searching first for a "best" local cosine basis which approximates the covariance by a band or a diagonal matrix. The estimation is obtained from regularized versions of the diagonal coefficients in the best basis.
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拟最大似然断点估计的锐信噪比阈值
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非平稳时间序列条件独立检验的动态广义协方差度量
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