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An Iterated Parametric Approach to Nonstationary Signal Extraction
An Iterated Parametric Approach to Nonstationary Signal Extraction
RRS2004-05
Abstract
Consider the three-component time series model that decomposes observed data (Y) into the sum of seasonal (S), trend (T), and irregular (I) portions. Assuming that S and T are nonstationary and that I is stationary, it is demonstrated that widely-used Wiener-Kolmogorov signal extraction estimates of S and T can be obtained through an iteration scheme applied to optimal estimates derived from reduced two-component models for Y^S = S + I and Y^T = T + I . This “bootstrapping” signal extraction methodology is reminiscent of X-11’s iterated nonparametric approach. The analysis of the iteration scheme provides insight into the algebraic relationship between full model and reduced model signal extraction estimates.
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Page Last Revised - October 28, 2021
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