手法を比較

	構造的ブレークOLS	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	1960–1998	1992
提唱者	Chow (1960) for the breakpoint test; Bai & Perron (1998) for multiple break estimation	Eric Zivot and Donald W. K. Andrews
種類	Segmented linear regression	Unit root test with endogenous structural break
原典	Bai, J., & Perron, P. (1998). Estimating and testing linear models with multiple structural changes. Econometrica, 66(1), 47–78.	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	OLS with structural breaks, piecewise OLS, regime-switching OLS, breakpoint regression	ZA test, Zivot-Andrews unit root test, endogenous structural break unit root test, ZA structural break test
関連	6	6
概要	Structural Break OLS extends ordinary least squares to allow regression coefficients to shift at one or more breakpoints in time or across regimes. Rather than forcing a single coefficient vector across the entire sample, the model partitions the data and estimates a separate OLS regression within each segment, making it appropriate when economic relationships are suspected to change due to policy shifts, crises, or other structural events.	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.