Bandingkan kaedah

	Pecahan Varians Ralat Ramalan (FEVD)	Fungsi Gerak Balas Impuls (IRF)
Bidang	Ekonometrik	Ekonometrik
Keluarga	Regression model	Regression model
Tahun asal	2005	2005
Pengasas	Helmut Lütkepohl	Helmut Lütkepohl
Jenis	Multivariate time series analysis tool	Post-estimation diagnostic
Sumber perintis	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
Alias	Variance Decomposition, Error Variance Decomposition, VD Analysis, Varyans Ayrıştırması	IRF, Dynamic Multiplier, Shock Response Function, Etki Tepki Fonksiyonu
Berkaitan	3	3
Ringkasan	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.	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.