V-Lab
S&P GSCI Light Energy Spot Index GJR-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
11.12%
decreased by 0.21%
1 Week
11.16%
decreased by 0.17%
1 Month
11.35%
increased by 0.02%
Analysis last updated: Saturday, September 19, 2026 at 12:02 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 18, 2026Model Insight
With persistence 0.997, volatility shocks have a half-life of 199 trading days (~0.8 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
σ
GJR-GARCH Model
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High persistence: persistence 0.997, shock half-life ~199 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0038 | 4.05*** |
| αARCH | 0.0528 | 5.28*** |
| βGARCH | 0.9425 | 169.17*** |
| γleverage | 0.0025 | 0.15 |
0.997
Persistence199d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0038 | 4.05*** |
α ARCH Response to squared shocks | 0.0528 | 5.28*** |
β GARCH Volatility persistence | 0.9425 | 169.17*** |
γ leverage Additional response to negative shocks | 0.0025 | 0.15 |
Persistence:
0.997
Half-life:
199 days
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