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V-Lab

American Express Co Spline-GARCH Volatility Analysis

Volatility prediction for Friday, October 23rd, 2026

1 Day

19.64%

decreased by 0.52%

1 Week

20.07%

decreased by 0.09%

1 Month

21.49%

increased by 1.33%

Analysis last updated: Thursday, October 22, 2026 at 09:34 PM UTC

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Date Range:

from

10/22/2024

to

10/22/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of American Express Co SGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Oct 16, 2026

Model Insight

This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 31 trading days.

τ

Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst1.5281
7.00***
αARCH0.0826
10.44***
βGARCH0.8956
97.96***
∑γi Spline Coefficients
K=6
γ10.0595
3.94***
γ2-0.1078
-4.51***
γ30.0895
5.41***
γ4-0.0683
-4.12***
γ50.0594
2.56**
γ6-0.0784
-2.08**

0.978

Persistence

31d

Half-life
τ

Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.5281
7.00***
α

ARCH

Response to squared shocks

0.0826
10.44***
β

GARCH

Volatility persistence

0.8956
97.96***
∑γi Spline Coefficients
K=6
γ10.0595
3.94***
γ2-0.1078
-4.51***
γ30.0895
5.41***
γ4-0.0683
-4.12***
γ50.0594
2.56**
γ6-0.0784
-2.08**

Persistence:

0.978

Half-life:

31 days