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| Zivot-Andrews Strukturel Brud Test× | Augmented Dickey-Fuller (ADF) Enhedsrodstest× | |
|---|---|---|
| Fagområde | Økonometri | Økonometri |
| Familie | Regression model | Regression model |
| Oprindelsesår≠ | 1992 | 1979–1984 |
| Ophavsperson≠ | Eric Zivot and Donald W. K. Andrews | Said & Dickey (1984); building on Dickey & Fuller (1979) |
| Type≠ | Unit root test with endogenous structural break | Hypothesis test (unit root) |
| Oprindelig kilde≠ | Zivot, E., & Andrews, D. W. K. (1992). Further evidence on the great crash, the oil-price shock, and the unit-root hypothesis. Journal of Business & Economic Statistics, 10(3), 251–270. DOI ↗ | Said, S. E., & Dickey, D. A. (1984). Testing for unit roots in autoregressive-moving average models of unknown order. Biometrika, 71(3), 599–607. DOI ↗ |
| Aliasser | ZA test, Zivot-Andrews unit root test, endogenous structural break unit root test, ZA structural break test | ADF test, ADF unit root test, Dickey-Fuller test (augmented), Said-Dickey test |
| Relaterede≠ | 6 | 5 |
| Resumé≠ | The Zivot-Andrews (ZA) test is a unit root test that endogenously identifies the most likely location of a single structural break in a time series. Unlike the standard ADF test, it does not require the researcher to pre-specify when the break occurred, making it robust to data-driven regime shifts such as policy changes, financial crises, or major economic events. | The Augmented Dickey-Fuller test is the standard procedure for determining whether a univariate time series contains a unit root — that is, whether the series is non-stationary. It extends the original Dickey-Fuller test by including lagged difference terms that absorb serial correlation in the residuals, making the test valid for a wide range of time-series processes encountered in economics and finance. |
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