V-Lab
American Express Co MF2-GARCH Volatility Analysis
Volatility prediction for Wednesday, September 16th, 2026
1 Day
22.79%
increased by 0.27%
1 Week
23.28%
increased by 0.76%
1 Month
24.75%
increased by 2.23%
Analysis last updated: Tuesday, September 15, 2026 at 09:21 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 11, 2026Model Insight
This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.
σ
MF2-GARCH Model
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Leverage: volatility responds almost entirely to negative shocks
| Param | Value | t-stat |
|---|---|---|
| mwindow | 66 | |
| αARCH | 0.0084 | 1.47 |
| βGARCH | 0.8849 | 88.13*** |
| γleverage | 0.1366 | 9.73*** |
| λ₁tau intercept | 0.0109 | 1.60 |
| λ₂forecast adj. | 0.0273 | 2.87*** |
| λ₃tau persistence | 0.9701 | 92.64*** |
0.962
Persistence18d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 66 | |
α ARCH Response to squared shocks | 0.0084 | 1.47 |
β GARCH Volatility persistence | 0.8849 | 88.13*** |
γ leverage Additional response to negative shocks | 0.1366 | 9.73*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0109 | 1.60 |
λ₂ forecast adj. Forecast performance sensitivity | 0.0273 | 2.87*** |
λ₃ tau persistence Long-term factor persistence | 0.9701 | 92.64*** |
Persistence:
0.962
Half-life:
18 days
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