手法を比較

	構造的ブレークEGARCHモデル	Zivot-Andrews構造変化検定
分野	計量経済学	計量経済学
系統	Regression model	Regression model
提唱年	1990–1991	1992
提唱者	Nelson (1991) for EGARCH; Lamoureux and Lastrapes (1990) for break-augmented GARCH variants	Eric Zivot and Donald W. K. Andrews
種類	Volatility model with structural breaks	Unit root test with endogenous structural break
原典	Nelson, D. B. (1991). Conditional heteroskedasticity in asset returns: A new approach. Econometrica, 59(2), 347–370.	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.
別名	SB-EGARCH, EGARCH with regime shifts, break-adjusted EGARCH, structural change EGARCH	ZA test, Zivot-Andrews unit root test, endogenous structural break unit root test, ZA structural break test
関連	5	6
概要	Structural Break EGARCH combines Nelson's Exponential GARCH framework with explicit allowance for one or more structural breaks in the volatility process. By letting the intercept and persistence parameters of the log-variance equation shift at detected break dates, the model avoids the spurious long-memory and inflated persistence that standard EGARCH suffers when the data contain regime changes.	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.