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	Structural Break WLS	OLS con Rilevazione di Rotture Strutturali
Campo	Econometria	Econometria
Famiglia	Regression model	Regression model
Anno di origine	1998 (break framework); WLS long-established	1960–1998
Ideatore	Bai & Perron (structural break framework); WLS classical	Chow (1960) for the breakpoint test; Bai & Perron (1998) for multiple break estimation
Tipo	Weighted regression with regime shifts	Segmented linear regression
Fonte seminale	Bai, J., & Perron, P. (1998). Estimating and testing linear models with multiple structural changes. Econometrica, 66(1), 47-78.	Bai, J., & Perron, P. (1998). Estimating and testing linear models with multiple structural changes. Econometrica, 66(1), 47–78.
Alias	WLS with structural change, break-corrected WLS, segmented WLS, structural break weighted regression	OLS with structural breaks, piecewise OLS, regime-switching OLS, breakpoint regression
Correlati	5	6
Sintesi	Structural Break WLS combines Weighted Least Squares estimation with explicit detection and correction for structural breaks — abrupt regime shifts — in the data. By identifying break points and assigning observation-level weights that account for heteroscedasticity within and across regimes, the estimator delivers consistent, efficient coefficient estimates even when the error variance changes dramatically at a break.	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.