V-Lab
State Street SPDR S&P 500 ETF Trust MF2-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 29th, 2026
1 Day
11.73%
increased by 1.11%
1 Week
12.11%
increased by 1.49%
1 Month
13.22%
increased by 2.60%
Analysis last updated: Monday, September 28, 2026 at 09:56 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 29, 1993 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 | 61 | |
| αARCH | 0.0000 | 0.00 |
| βGARCH | 0.8300 | 54.73*** |
| γleverage | 0.2208 | 12.33*** |
| λ₁tau intercept | 0.0121 | 1.60 |
| λ₂forecast adj. | 0.0569 | 2.04** |
| λ₃tau persistence | 0.9324 | 27.90*** |
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 | 0.8300 | 54.73*** |
γ leverage Additional response to negative shocks | 0.2208 | 12.33*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0121 | 1.60 |
λ₂ forecast adj. Forecast performance sensitivity | 0.0569 | 2.04** |
λ₃ tau persistence Long-term factor persistence | 0.9324 | 27.90*** |
Persistence:
0.940
Half-life:
11 days
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