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	Tidsvarierande parameter System GMM	Dynamisk paneldatamodell
Ämnesområde	Ekonometri	Ekonometri
Familj	Regression model	Regression model
Ursprungsår	1998 (System GMM); TVP extensions in applied literature thereafter	1991–1998
Upphovsperson	Blundell & Bond (System GMM base); Cooley & Prescott (TVP framework)	Arellano & Bond (1991); Blundell & Bond (1998)
Typ	Dynamic panel estimator with time-varying coefficients	Dynamic panel regression
Ursprungskälla	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	TVP System GMM, time-varying System GMM, TVP-SGMM, dynamic panel TVP estimator	dynamic panel model, lagged dependent variable panel model, Arellano-Bond type dynamic panel, GMM dynamic panel
Närliggande	6	5
Sammanfattning	Time-Varying Parameter System GMM extends the Blundell-Bond System Generalized Method of Moments estimator to allow regression coefficients to change over time. By combining the instrument-based correction for dynamic endogeneity with a time-varying coefficient structure, the method captures both the persistence of the lagged dependent variable and structural shifts in the effect of regressors across periods.	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.