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	param	t-stat
$ω$	1.3295	6.68
$α$	0.0812	10.17
$β$	0.8928	86.18
$γ_{1}$	0.0251	0.84
$γ_{2}$	0.0048	0.10
$γ_{3}$	-0.1167	-2.81
$γ_{4}$	0.1903	4.84
$γ_{5}$	-0.1774	-3.85
$γ_{6}$	0.1153	2.03
$γ_{7}$	-0.0428	-0.92
$γ_{8}$	-0.0097	-0.39

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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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