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	Strukturel Brud Difference GMM	Difference GMM (Arellano-Bond Estimator)
Fagområde	Økonometri	Økonometri
Familie	Regression model	Regression model
Oprindelsesår	1991 / 1998	1991
Ophavsperson	Arellano & Bond (Difference GMM); Bai & Perron (structural break testing)	Manuel Arellano and Stephen Bond
Type	Dynamic panel estimator with structural breaks	GMM panel estimator
Oprindelig kilde	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.	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.
Aliasser	Difference GMM with structural breaks, break-augmented Arellano-Bond GMM, dynamic panel GMM with regime shifts, structural change Difference GMM	Arellano-Bond estimator, AB-GMM, first-difference GMM, difference GMM estimator
Relaterede	6	5
Resumé	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.	Difference GMM, introduced by Arellano and Bond (1991), estimates dynamic panel data models by first-differencing the equation to remove fixed effects, then using lagged levels of the endogenous variables as GMM instruments. It is the standard approach when a lagged dependent variable or other endogenous regressors are present in a panel with many units and few time periods.