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| Έλεγχος μοναδιαίας ρίζας Fourier ADF× | Δοκιμή Phillips-Perron για Μοναδιαία Ρίζα× | |
|---|---|---|
| Πεδίο | Οικονομετρία | Οικονομετρία |
| Οικογένεια | Regression model | Regression model |
| Έτος προέλευσης≠ | 2006-2012 | 1988 |
| Δημιουργός≠ | Becker, Enders, and Lee; Enders and Lee | Peter C. B. Phillips and Pierre Perron |
| Τύπος≠ | Unit root test with smooth structural breaks | Hypothesis test (unit root) |
| 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. DOI ↗ | Phillips, P. C. B., & Perron, P. (1988). Testing for a unit root in time series regression. Biometrika, 75(2), 335–346. DOI ↗ |
| Εναλλακτικές ονομασίες | Fourier ADF test, FADF test, Flexible Fourier ADF, Fourier-based ADF unit root test | PP test, PP unit root test, Phillips-Perron test, nonparametric unit root test |
| Συναφείς≠ | 6 | 5 |
| 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 Phillips-Perron (PP) test is a nonparametric unit root test for time series that corrects for serial correlation and heteroscedasticity in the error term without adding lagged differences. Introduced by Phillips and Perron (1988), it applies a kernel-based long-run variance estimator to adjust the Dickey-Fuller statistic, making it robust to a wide class of weakly dependent error processes. |
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