Confronta i metodi

	GMM a Sistema (Stimatore di Blundell-Bond)	Modello Dinamico a Dati Panel
Campo	Econometria	Econometria
Famiglia	Regression model	Regression model
Anno di origine	1998	1991–1998
Ideatore	Blundell & Bond (1998); Arellano & Bover (1995)	Arellano & Bond (1991); Blundell & Bond (1998)
Tipo	GMM estimator for dynamic panel data	Dynamic panel regression
Fonte seminale	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.
Alias	System GMM, Blundell-Bond estimator, SYS-GMM, two-step System GMM	dynamic panel model, lagged dependent variable panel model, Arellano-Bond type dynamic panel, GMM dynamic panel
Correlati	6	5
Sintesi	Panel System GMM is a two-equation GMM estimator for dynamic panel data that stacks the differenced equation (using lagged levels as instruments) with the levels equation (using lagged differences as instruments). Developed by Blundell and Bond (1998) on the foundation of Arellano and Bover (1995), it is the preferred tool when the lagged dependent variable is highly persistent or individual effects are large.	The dynamic panel data model extends standard panel regression by including one or more lagged values of the outcome variable as regressors. Because past outcomes directly predict current outcomes, the model captures persistence and adjustment dynamics — but it also introduces a correlation between the lagged dependent variable and the individual fixed effect, rendering OLS and standard fixed-effects estimators inconsistent. GMM-based approaches developed by Arellano-Bond and Blundell-Bond resolve this problem.