Usporedite metode

	WLS (Weighted Least Squares) sa strukturnim lomom (Structural Break WLS)	Ponderirani najmanji kvadrati (WLS)
Područje	Ekonometrija	Statistika
Obitelj	Regression model	Regression model
Godina nastanka	1998 (break framework); WLS long-established	1935
Tvorac	Bai & Perron (structural break framework); WLS classical	Alexander Craig Aitken
Vrsta	Weighted regression with regime shifts	Weighted linear estimator
Temeljni izvor	Bai, J., & Perron, P. (1998). Estimating and testing linear models with multiple structural changes. Econometrica, 66(1), 47-78.	Aitken, A. C. (1935). IV.—On least squares and linear combination of observations. Proceedings of the Royal Society of Edinburgh, 55, 42–48.
Drugi nazivi	WLS with structural change, break-corrected WLS, segmented WLS, structural break weighted regression	WLS, weighted regression, heteroscedasticity-corrected OLS, variance-weighted least squares
Srodne	5	3
Sažetak	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.	Weighted Least Squares is a generalization of Ordinary Least Squares (OLS) regression that assigns each observation a weight inversely proportional to its error variance, thereby down-weighting high-variance data points and up-weighting precise ones. Introduced in its general matrix form by Alexander Craig Aitken in 1935, WLS is the canonical remedy when heteroscedasticity is present and the error variance structure is known or can be reliably estimated.