Σύγκριση μεθόδων

	Σύστημα GMM με Δομικά Διαλείμματα	Εκτιμητής GMM Arellano-Bond
Πεδίο	Οικονομετρία	Οικονομετρία
Οικογένεια	Regression model	Regression model
Έτος προέλευσης	1998–2003	1991
Δημιουργός	Blundell & Bond (System GMM); Bai & Perron (structural break framework)	Manuel Arellano and Stephen Bond
Τύπος	Dynamic panel estimator with regime change	GMM estimator for dynamic panel data
Θεμελιώδης πηγή	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. Review of Economic Studies, 58(2), 277-297.
Εναλλακτικές ονομασίες	System GMM with structural breaks, SB-SGMM, break-augmented System GMM, System GMM structural change estimator	AB-GMM, Difference GMM, first-difference GMM, Arellano-Bond estimator
Συναφείς	6	5
Σύνοψη	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.	The Arellano-Bond GMM estimator is the standard approach for dynamic panel data models in which the lagged dependent variable appears as a regressor. By first-differencing to remove fixed effects and using deeper lags as instruments, it yields consistent estimates even when the error is serially correlated and regressors are endogenous.