A test for the absence of aliasing or local white noise in locally stationary wavelet time series
局部平稳小波时间序列中无混叠或局部白噪声的检验AI 解读 ↓
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局部平稳小波时间序列中无混叠或局部白噪声的检验AI 解读 ↓
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Aliasing is often overlooked in time series analysis but can seriously distort the spectrum, the autocovariance and their estimates.We show that dyadic subsampling of a locally stationary wavelet process, which can cause aliasing, results in a process that is the sum of asymptotic white noise and another locally stationary wavelet process with a modified spectrum.We develop a test for the absence of aliasing in a locally stationary wavelet series at a fixed location, and illustrate its application on simulated data and a wind energy time series.A useful by-product is a new test for local white noise.The tests are robust with respect to model misspecification in that the analysis and synthesis wavelets do not need to be identical.Hence, in principle, the tests work irrespective of which wavelet is used to analyse the time series, although in practice there is a trade-off between increasing statistical power and time localization of the test.