V-Lab
S&P 500 Index MF2-GARCH Volatility Analysis
Volatility prediction for Thursday, September 24th, 2026
1 Day
11.53%
increased by 1.06%
1 Week
11.86%
increased by 1.39%
1 Month
12.89%
increased by 2.42%
Analysis last updated: Thursday, September 24, 2026 at 12:21 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Sep 18, 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 | 61 | |
| αARCH | 0.0000 | 0.00 |
| βGARCH | 0.8393 | 62.36*** |
| γleverage | 0.1975 | 12.18*** |
| λ₁tau intercept | 0.0107 | 1.66* |
| λ₂forecast adj. | 0.0629 | 2.02** |
| λ₃tau persistence | 0.9264 | 25.36*** |
0.938
Persistence11d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 61 | |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8393 | 62.36*** |
γ leverage Additional response to negative shocks | 0.1975 | 12.18*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0107 | 1.66* |
λ₂ forecast adj. Forecast performance sensitivity | 0.0629 | 2.02** |
λ₃ tau persistence Long-term factor persistence | 0.9264 | 25.36*** |
Persistence:
0.938
Half-life:
11 days
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