V-Lab
S&P 500 Index MF2-GARCH Volatility Analysis
Volatility prediction for Monday, August 17th, 2026
1 Day
10.95%
decreased by 0.18%
1 Week
11.55%
increased by 0.42%
1 Month
13.07%
increased by 1.94%
Analysis last updated: Saturday, August 15, 2026 at 12:16 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Aug 14, 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
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 61 | |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8391 | 222.16*** |
γ leverage Additional response to negative shocks | 0.1977 | 44.79*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0107 | 5.68*** |
λ₂ forecast adj. Forecast performance sensitivity | 0.0630 | 4.43*** |
λ₃ tau persistence Long-term factor persistence | 0.9263 | 57.82*** |
Persistence:
0.938
Half-life:
11 days
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