V-Lab
State Street SPDR S&P 500 ETF Trust MF2-GARCH Volatility Analysis
Volatility prediction for Wednesday, September 9th, 2026
1 Day
11.52%
increased by 0.41%
1 Week
11.94%
increased by 0.83%
1 Month
13.03%
increased by 1.92%
Analysis last updated: Tuesday, September 8, 2026 at 10:44 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 29, 1993 to Sep 4, 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 | 0.8298 | 54.64*** |
| γleverage | 0.2210 | 12.33*** |
| λ₁tau intercept | 0.0122 | 1.60 |
| λ₂forecast adj. | 0.0572 | 2.04** |
| λ₃tau persistence | 0.9321 | 27.75*** |
0.940
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 | 0.8298 | 54.64*** |
γ leverage Additional response to negative shocks | 0.2210 | 12.33*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0122 | 1.60 |
λ₂ forecast adj. Forecast performance sensitivity | 0.0572 | 2.04** |
λ₃ tau persistence Long-term factor persistence | 0.9321 | 27.75*** |
Persistence:
0.940
Half-life:
11 days
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