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	param	t-stat
$ω$	1.3108	6.71
$α$	0.0806	10.05
$β$	0.8925	84.46
$γ_{1}$	0.0217	0.72
$γ_{2}$	0.0128	0.26
$γ_{3}$	-0.1265	-3.07
$γ_{4}$	0.2002	5.18
$γ_{5}$	-0.1860	-4.04
$γ_{6}$	0.1200	2.16
$γ_{7}$	-0.0412	-0.94
$γ_{8}$	-0.0132	-0.57

V-Lab

American Express Co Zero Slope Spline-GARCH Volatility Analysis

Volatility Prediction for Wednesday, January 28th, 2026:30.83% (-0.77%)

Date Range:

Parameter Estimates

News Impact Curve

Volatility Forecasts

Other American Express Co Analyses