手法を比較

	時間変動係数VARモデル（TVP-VAR）	ベイズ型VARモデル（BVAR）
分野	計量経済学	計量経済学
系統	Regression model	Regression model
提唱年	2005	1984
提唱者	Primiceri (2005); Cogley & Sargent (2001, 2005)	Doan, Litterman & Sims
種類	Multivariate time-series model with drifting coefficients	Multivariate time-series model
原典	Primiceri, G. E. (2005). Time varying structural vector autoregressions and monetary policy. Review of Economic Studies, 72(3), 821-852.	Doan, T., Litterman, R., & Sims, C. (1984). Forecasting and conditional projection using realistic prior distributions. Econometric Reviews, 3(1), 1–100.
別名	TVP-VAR, time-varying VAR, TV-VAR, drifting-coefficient VAR	BVAR, Bayesian VAR, Bayesian vector autoregressive model, BVAR model
関連	6	5
概要	The Time-Varying Parameter VAR (TVP-VAR) model extends the standard vector autoregression by allowing the coefficients and error covariances to evolve gradually over time. Estimated via Bayesian methods and MCMC simulation, it captures how dynamic relationships between macroeconomic or financial variables shift across different economic regimes without requiring pre-specified break points.	The Bayesian Vector Autoregression (BVAR) model extends the classical VAR framework by incorporating prior beliefs about the model coefficients. Priors — most commonly the Minnesota prior — shrink VAR coefficients toward economically sensible values, dramatically reducing overfitting and improving out-of-sample forecast accuracy even when the number of variables is large.