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Inferences from tests for non-stationarity depend critically on whether and how breaks and/or non-linearities are specified. Recent work has shown that wavelet transformations that separate a variable’s high and low frequency components can enhance the performance of unit root and stationarity tests. This note provides response surface estimates of finite sample, lag-adjusted critical values and approximate probability values for an Augmented Dickey–Fuller type wavelet test that includes a Fourier term allowing for smooth breaks in the series. Applications highlight the practical benefits.
Computational Economics – Springer Journals
Published: Aug 1, 2024
Keywords: Integrated processes; Akaike information criterion; Bayesian information criterion; Wavelet; Unit root test; C12; C15; C22
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