Haar–Fisz estimation of evolutionary wavelet spectra
Haar–Fisz estimation of evolutionary wavelet spectra
复制标题
演化小波谱的 Haar-Fisz 估计
DOI:
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发表时间:
2006
期刊:
影响因子:
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通讯作者:
G. Nason
中科院分区:
文献类型:
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作者:
P. Fryzlewicz;G. Nason
Summary. We propose a new ‘Haar–Fisz’ technique for estimating the time‐varying, piecewise constant local variance of a locally stationary Gaussian time series. We apply our technique to the estimation of the spectral structure in the locally stationary wavelet model. Our method combines Haar wavelets and the variance stabilizing Fisz transform. The resulting estimator is mean square consistent, rapidly computable and easy to implement, and performs well in practice. We also introduce the ‘Haar–Fisz transform’, a device for stabilizing the variance of scaled χ2‐data and bringing their distribution close to Gaussianity.