V-Lab
Proshares S&P 500 EX-Technology ETF MF2-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 29th, 2026
1 Day
12.41%
increased by 1.39%
1 Week
12.53%
increased by 1.51%
1 Month
12.84%
increased by 1.82%
Analysis last updated: Monday, September 28, 2026 at 09:55 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 24, 2015 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 | 46 | |
| αARCH | 0.0043 | 0.11 |
| βGARCH | 0.7844 | 19.36*** |
| γleverage | 0.2361 | 5.12*** |
| λ₁tau intercept | 0.0308 | 1.04 |
| λ₂forecast adj. | 0.0666 | 1.32 |
| λ₃tau persistence | 0.8965 | 11.51*** |
0.907
Persistence7d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 46 | |
α ARCH Response to squared shocks | 0.0043 | 0.11 |
β GARCH Volatility persistence | 0.7844 | 19.36*** |
γ leverage Additional response to negative shocks | 0.2361 | 5.12*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0308 | 1.04 |
λ₂ forecast adj. Forecast performance sensitivity | 0.0666 | 1.32 |
λ₃ tau persistence Long-term factor persistence | 0.8965 | 11.51*** |
Persistence:
0.907
Half-life:
7 days
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