V-Lab
S&P Composite 1500 Index MF2-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
12.05%
decreased by 0.41%
1 Week
12.62%
increased by 0.16%
1 Month
14.17%
increased by 1.71%
Analysis last updated: Saturday, September 19, 2026 at 12:02 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 31, 1994 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 | 0.8379 | 58.12*** |
| γleverage | 0.2139 | 12.15*** |
| λ₁tau intercept | 0.0119 | 1.82* |
| λ₂forecast adj. | 0.0533 | 2.41** |
| λ₃tau persistence | 0.9364 | 35.08*** |
0.945
Persistence12d
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 | 0.8379 | 58.12*** |
γ leverage Additional response to negative shocks | 0.2139 | 12.15*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0119 | 1.82* |
λ₂ forecast adj. Forecast performance sensitivity | 0.0533 | 2.41** |
λ₃ tau persistence Long-term factor persistence | 0.9364 | 35.08*** |
Persistence:
0.945
Half-life:
12 days
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