Σύγκριση μεθόδων

	Έλεγχος μοναδιαίας ρίζας Fourier ADF	Δοκιμή KPSS με όρους Fourier για Στασιμότητα με Ομαλές Δομικές Ρήξεις
Πεδίο	Οικονομετρία	Οικονομετρία
Οικογένεια	Regression model	Regression model
Έτος προέλευσης	2006-2012	2006
Δημιουργός	Becker, Enders, and Lee; Enders and Lee	Becker, Enders, and Lee
Τύπος	Unit root test with smooth structural breaks	Stationarity test
Θεμελιώδης πηγή	Becker, R., Enders, W., & Lee, J. (2006). A stationarity test in the presence of an unknown number of smooth breaks. Journal of Time Series Analysis, 27(3), 381-409.	Becker, R., Enders, W., & Lee, J. (2006). A stationarity test in the presence of an unknown number of smooth breaks. Journal of Time Series Analysis, 27(3), 381-409.
Εναλλακτικές ονομασίες	Fourier ADF test, FADF test, Flexible Fourier ADF, Fourier-based ADF unit root test	Fourier KPSS, flexible Fourier stationarity test, F-KPSS, KPSS with Fourier approximation
Συναφείς	6	3
Σύνοψη	The Fourier ADF unit root test extends the standard Augmented Dickey-Fuller framework by incorporating low-frequency Fourier terms into the deterministic component. This allows the test to approximate smooth, gradual structural breaks in the level or trend of a time series without requiring prior knowledge of break number, timing, or form.	The Fourier KPSS test extends the standard KPSS stationarity test by embedding a flexible Fourier series in the deterministic component of the model. This approach captures smooth, gradual structural breaks in the level or trend of a time series without requiring the researcher to specify the number or timing of those breaks, yielding more reliable inference under structural change.