手法を比較

	DCC-GARCHモデル（動学的条件付き相関）	TGARCHモデル（Threshold GARCH）
分野	計量経済学	計量経済学
系統	Regression model	Regression model
提唱年	2002	1993-1994
提唱者	Robert F. Engle	Zakoian (1994); Glosten, Jagannathan & Runkle (1993)
種類	Multivariate volatility model	Asymmetric volatility model
原典	Engle, R. F. (2002). Dynamic conditional correlation: A simple class of multivariate generalized autoregressive conditional heteroskedasticity models. Journal of Business and Economic Statistics, 20(3), 339-350.	Zakoian, J.-M. (1994). Threshold heteroskedastic models. Journal of Economic Dynamics and Control, 18(5), 931-955.
別名	DCC-GARCH, Dynamic Conditional Correlation GARCH, Engle DCC model, multivariate DCC	Threshold GARCH, TGARCH, GJR-GARCH, asymmetric GARCH
関連	5	6
概要	The DCC-GARCH model, introduced by Engle (2002), extends univariate GARCH to capture time-varying correlations between multiple financial time series. It decomposes the multivariate conditional covariance matrix into individual volatility processes and a dynamic correlation matrix, allowing correlations to fluctuate over time while remaining computationally tractable even with many series.	The Threshold GARCH (TGARCH) model extends the standard GARCH framework by allowing positive and negative return shocks to have asymmetric effects on conditional variance. Negative shocks — bad news — typically amplify volatility more than positive shocks of the same magnitude, a stylised fact known as the leverage effect. TGARCH captures this asymmetry through a threshold indicator that switches on when the previous period's shock was negative.