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	param	t-stat
$ω$	1.3255	6.68
$α$	0.0816	10.17
$β$	0.8920	85.09
$γ_{1}$	0.0240	0.80
$γ_{2}$	0.0074	0.15
$γ_{3}$	-0.1199	-2.90
$γ_{4}$	0.1934	4.95
$γ_{5}$	-0.1797	-3.90
$γ_{6}$	0.1159	2.05
$γ_{7}$	-0.0409	-0.90
$γ_{8}$	-0.0121	-0.50

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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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