手法を比較

	時間変動係数システムGMM	アレラーノ・ボンド GMM 推定器
分野	計量経済学	計量経済学
系統	Regression model	Regression model
提唱年	1998 (System GMM); TVP extensions in applied literature thereafter	1991
提唱者	Blundell & Bond (System GMM base); Cooley & Prescott (TVP framework)	Manuel Arellano and Stephen Bond
種類	Dynamic panel estimator with time-varying coefficients	GMM estimator for dynamic panel data
原典	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.
別名	TVP System GMM, time-varying System GMM, TVP-SGMM, dynamic panel TVP estimator	AB-GMM, Difference GMM, first-difference GMM, Arellano-Bond estimator
関連	6	5
概要	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 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.