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	param	t-stat
$ω$	1.3102	6.68
$α$	0.0811	10.12
$β$	0.8920	84.70
$γ_{1}$	0.0232	0.78
$γ_{2}$	0.0085	0.17
$γ_{3}$	-0.1203	-2.93
$γ_{4}$	0.1938	5.00
$γ_{5}$	-0.1808	-3.97
$γ_{6}$	0.1180	2.11
$γ_{7}$	-0.0436	-0.96
$γ_{8}$	-0.0100	-0.41

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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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