Сравнение на методи

	Системна GMM оценка при структурни промени	Разлика GMM при структурни промени
Област	Иконометрия	Иконометрия
Семейство	Regression model	Regression model
Година на възникване	1998–2003	1991 / 1998
Създател	Blundell & Bond (System GMM); Bai & Perron (structural break framework)	Arellano & Bond (Difference GMM); Bai & Perron (structural break testing)
Тип	Dynamic panel estimator with regime change	Dynamic panel estimator with structural breaks
Основополагащ източник	Blundell, R., & Bond, S. (1998). Initial conditions and moment restrictions in dynamic panel data models. Journal of Econometrics, 87(1), 115–143.	Arellano, M., & Bond, S. (1991). Some tests of specification for panel data: Monte Carlo evidence and an application to employment equations. The Review of Economic Studies, 58(2), 277–297.
Други названия	System GMM with structural breaks, SB-SGMM, break-augmented System GMM, System GMM structural change estimator	Difference GMM with structural breaks, break-augmented Arellano-Bond GMM, dynamic panel GMM with regime shifts, structural change Difference GMM
Свързани	6	6
Резюме	Structural Break System GMM extends the Blundell-Bond System GMM estimator for dynamic panel data by explicitly accounting for structural breaks — abrupt regime changes in slopes, intercepts, or dynamics — that, if ignored, bias the coefficient estimates and invalidate the moment conditions that underpin standard GMM inference.	Structural Break Difference GMM extends the Arellano-Bond first-difference GMM estimator to dynamic panel settings where the data-generating process shifts at one or more unknown breakpoints. By explicitly incorporating break indicators or allowing regime-specific parameters, the estimator avoids the biased coefficient and invalid moment conditions that arise when a structural change is ignored in a standard Difference GMM fit.