So sánh phương pháp

	Hàm Phản ứng Xung lực (IRF)	Phân rã phương sai lỗi dự báo (FEVD)
Lĩnh vực	Kinh tế lượng	Kinh tế lượng
Họ	Regression model	Regression model
Năm ra đời	2005	2005
Người khởi xướng	Helmut Lütkepohl	Helmut Lütkepohl
Loại	Post-estimation diagnostic	Multivariate time series analysis tool
Công trình gốc	Lütkepohl, H. (2005). New Introduction to Multiple Time Series Analysis. Springer. ISBN: 978-3-540-40172-8	Lütkepohl, H. (2005). New Introduction to Multiple Time Series Analysis. Springer. ISBN: 978-3-540-40172-8
Tên gọi khác	IRF, Dynamic Multiplier, Shock Response Function, Etki Tepki Fonksiyonu	Variance Decomposition, Error Variance Decomposition, VD Analysis, Varyans Ayrıştırması
Liên quan	3	3
Tóm tắt	The Impulse Response Function (IRF) traces the dynamic response of each variable in a Vector Autoregression (VAR) system to a one-unit shock in one of its error terms over a user-specified forecast horizon. It is the primary tool for structural analysis following VAR estimation and is widely used in macroeconomics, monetary economics, and finance to quantify how shocks propagate through interconnected time series systems.	Forecast Error Variance Decomposition (FEVD) is a multivariate time series technique used within Vector Autoregression (VAR) frameworks to quantify what proportion of the forecast error variance of each variable is attributable to shocks from every other variable in the system. It is widely used by econometricians, macroeconomists, and financial researchers to assess the relative importance of different structural disturbances in driving short-run and long-run fluctuations across interconnected economic series.