Σύγκριση μεθόδων

	Panel EGARCH	Μοντέλο Panel GARCH
Πεδίο	Οικονομετρία	Οικονομετρία
Οικογένεια	Regression model	Regression model
Έτος προέλευσης	1991 (EGARCH); panel extensions widely used from 2000s	1986 (GARCH); panel extension 1990s–2000s
Δημιουργός	Daniel B. Nelson (EGARCH); panel extension by applied econometrics literature	Bollerslev (1986); extended to panel settings in subsequent literature
Τύπος	Volatility model	Volatility model
Θεμελιώδης πηγή	Nelson, D. B. (1991). Conditional heteroskedasticity in asset returns: A new approach. Econometrica, 59(2), 347–370.	Bollerslev, T. (1986). Generalized autoregressive conditional heteroskedasticity. Journal of Econometrics, 31(3), 307–327.
Εναλλακτικές ονομασίες	Panel EGARCH model, panel exponential GARCH, EGARCH for panel data, cross-sectional EGARCH	panel GARCH, GARCH panel model, panel volatility model, panel conditional heteroscedasticity model
Συναφείς	4	6
Σύνοψη	Panel EGARCH extends Nelson's (1991) Exponential GARCH model to a panel setting, allowing conditional variance to evolve asymmetrically over time for each cross-sectional unit. The log specification ensures non-negative variance without parameter constraints, and the leverage term distinguishes whether negative shocks amplify volatility more than positive ones of equal magnitude.	The Panel GARCH model extends Bollerslev's (1986) Generalized Autoregressive Conditional Heteroscedasticity framework to panel data, allowing conditional variance to evolve over time for each cross-sectional unit. It simultaneously captures unit-level heterogeneity and time-varying volatility clustering, making it the standard tool for modelling risk and uncertainty in multi-entity financial and macroeconomic panels.