V-Lab
Proshares S&P 500 EX-Technology ETF MF2-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 8th, 2026
1 Day
12.11%
increased by 0.78%
1 Week
12.38%
increased by 1.05%
1 Month
13.06%
increased by 1.73%
Analysis last updated: Saturday, September 5, 2026 at 02:27 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 24, 2015 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 | 46 | |
| αARCH | 0.0042 | 0.11 |
| βGARCH | 0.7833 | 19.28*** |
| γleverage | 0.2379 | 5.13*** |
| λ₁tau intercept | 0.0310 | 1.04 |
| λ₂forecast adj. | 0.0669 | 1.32 |
| λ₃tau persistence | 0.8965 | 11.55*** |
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 | 0.0042 | 0.11 |
β GARCH Volatility persistence | 0.7833 | 19.28*** |
γ leverage Additional response to negative shocks | 0.2379 | 5.13*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0310 | 1.04 |
λ₂ forecast adj. Forecast performance sensitivity | 0.0669 | 1.32 |
λ₃ tau persistence Long-term factor persistence | 0.8965 | 11.55*** |
Persistence:
0.907
Half-life:
7 days
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