V-Lab
State Street Technology Select Sector SPDR ETF MF2-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 22nd, 2026
1 Day
23.18%
decreased by 0.64%
1 Week
24.14%
increased by 0.32%
1 Month
26.39%
increased by 2.57%
Analysis last updated: Monday, September 21, 2026 at 09:52 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Dec 22, 1998 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 | 31 | |
| αARCH | 0.0000 | 0.00 |
| βGARCH | 0.8288 | 47.39*** |
| γleverage | 0.1864 | 10.66*** |
| λ₁tau intercept | 0.0106 | 1.80* |
| λ₂forecast adj. | 0.0518 | 3.02*** |
| λ₃tau persistence | 0.9432 | 50.63*** |
0.922
Persistence9d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 31 | |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8288 | 47.39*** |
γ leverage Additional response to negative shocks | 0.1864 | 10.66*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0106 | 1.80* |
λ₂ forecast adj. Forecast performance sensitivity | 0.0518 | 3.02*** |
λ₃ tau persistence Long-term factor persistence | 0.9432 | 50.63*** |
Persistence:
0.922
Half-life:
9 days
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