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	param	t-stat
$ω$	1.3178	6.66
$α$	0.0812	10.15
$β$	0.8924	85.57
$γ_{1}$	0.0235	0.79
$γ_{2}$	0.0081	0.16
$γ_{3}$	-0.1203	-2.91
$γ_{4}$	0.1942	4.98
$γ_{5}$	-0.1807	-3.96
$γ_{6}$	0.1171	2.08
$γ_{7}$	-0.0422	-0.92
$γ_{8}$	-0.0110	-0.45

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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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