手法を比較

	構造変化を伴うZivot-Andrews単位根検定	構造的ブレーク単位根ADF検定
分野	計量経済学	計量経済学
系統	Regression model	Regression model
提唱年	1992	1989-1992
提唱者	Eric Zivot and Donald W. K. Andrews	Perron (1989); Zivot and Andrews (1992)
種類	Unit root test with endogenous structural break	Unit root test with structural break
原典	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.	Perron, P. (1989). The great crash, the oil price shock, and the unit root hypothesis. Econometrica, 57(6), 1361-1401.
別名	Zivot-Andrews test, ZA unit root test, endogenous structural break unit root test, ZA breakpoint test	ADF with structural break, Perron unit root test, break-augmented ADF, unit root test with structural change
関連	6	6
概要	The Zivot-Andrews test is an endogenous structural break unit root test that determines the break point from the data rather than imposing it externally. It tests for a unit root against the alternative of stationarity around a single structural break — in the mean, the trend, or both — choosing the break date that provides the strongest evidence against the null.	The structural break ADF unit root test extends the standard Augmented Dickey-Fuller test to allow for one or more discrete shifts in the level or trend of a time series. Because ignoring a structural break inflates the apparent persistence of a series, this test prevents false acceptance of the unit root null when the series is actually stationary around a shifting mean or trend.