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	param	t-stat
$ω$	1.3019	6.53
$α$	0.0814	10.19
$β$	0.8926	86.03
$γ_{1}$	0.0231	0.77
$γ_{2}$	0.0067	0.14
$γ_{3}$	-0.1164	-2.81
$γ_{4}$	0.1899	4.84
$γ_{5}$	-0.1770	-3.85
$γ_{6}$	0.1155	2.03
$γ_{7}$	-0.0440	-0.94
$γ_{8}$	-0.0082	-0.33

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American Express Co Zero Slope Spline-GARCH Volatility Analysis

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News Impact Curve

Volatility Forecast

Parameter Estimates

Other American Express Co Analyses