V-Lab
Vanguard S&P 500 ETF MF2-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 29th, 2026
1 Day
12.20%
increased by 1.41%
1 Week
12.53%
increased by 1.74%
1 Month
13.39%
increased by 2.60%
Analysis last updated: Monday, September 28, 2026 at 09:57 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 9, 2010 to Sep 25, 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 | 81 | |
| αARCH | 0.0000 | 0.00 |
| βGARCH | 0.8014 | 35.23*** |
| γleverage | 0.2682 | 9.92*** |
| λ₁tau intercept | 0.1054 | 1.62 |
| λ₂forecast adj. | 0.4009 | 2.42** |
| λ₃tau persistence | 0.4914 | 2.31** |
0.935
Persistence10d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 81 | |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8014 | 35.23*** |
γ leverage Additional response to negative shocks | 0.2682 | 9.92*** |
λ₁ tau intercept Baseline long-term coefficient | 0.1054 | 1.62 |
λ₂ forecast adj. Forecast performance sensitivity | 0.4009 | 2.42** |
λ₃ tau persistence Long-term factor persistence | 0.4914 | 2.31** |
Persistence:
0.935
Half-life:
10 days
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