S&P GSCI Natural Gas Index AGARCH Volatility Analysis
Volatility prediction for Wednesday, July 15th, 2026
1 Day
41.56%
decreased by 1.61%
1 Week
41.93%
decreased by 1.24%
1 Month
43.27%
increased by 0.10%
Analysis last updated: Tuesday, July 14, 2026 at 11:10 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 7, 1994 to Jul 10, 2026Model Insight
The news-impact curve is shifted (γ = -0.38) so that positive returns raise next-day volatility more than negative returns of the same size. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and rare among risky assets.
σ
AGARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1292 | 21.81*** |
α ARCH Response to squared shocks | 0.0804 | 50.91*** |
β GARCH Volatility persistence | 0.9081 | 573.64*** |
γ leverage Additional response to negative shocks | -0.3843 | -9.68*** |
Persistence:
0.988
Half-life:
60 days
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