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	param	t-stat
$ω$	1.2993	6.49
$α$	0.0816	10.24
$β$	0.8926	86.40
$γ_{1}$	0.0225	0.75
$γ_{2}$	0.0068	0.14
$γ_{3}$	-0.1150	-2.77
$γ_{4}$	0.1880	4.77
$γ_{5}$	-0.1749	-3.81
$γ_{6}$	0.1140	2.00
$γ_{7}$	-0.0435	-0.92
$γ_{8}$	-0.0084	-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

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