V-Lab
Proshares Ultra QQQ TOP 30 GJR-GARCH Volatility Analysis
High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful
Volatility prediction for Monday, July 27th, 2026
1 Day
52.27%
increased by 0.08%
1 Week
52.42%
increased by 0.23%
1 Month
53.05%
increased by 0.86%
Analysis last updated: Saturday, July 25, 2026 at 02:22 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Aug 15, 2025 to Jul 24, 2026Boundary Parameters
Hessian SE
Model Insight
Estimated persistence of 1.000 is at or above 1 (non-stationary): volatility shocks do not decay and the long-run variance is undefined, so long-horizon forecasts should be treated with caution.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0329 | 0.14 |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 1.0000 | 9.95*** |
γ leverage Additional response to negative shocks | 0.0000 | 0.00 |
Persistence:
1.000
Half-life:
-
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