S&P GSCI Energy and Metals Spot Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, November 2nd, 2026
1 Day
21.51%
1 Week
21.63%
1 Month
22.09%
Analysis last updated: Friday, October 30, 2026 at 11:06 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 6, 1995 to Oct 30, 2026Model Insight
With persistence 0.992, volatility shocks have a half-life of 87 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 7.58 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωlong-run | 3.1760 | 1.67* |
| αscore | 0.0566 | 9.78*** |
| βpersistence | 0.9920 | 190.04*** |
| νDF | 7.5771 | 1.38 |
0.992
Persistence87d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 3.1760 | 1.67* |
α score Weight on the scaled score | 0.0566 | 9.78*** |
β persistence Volatility persistence | 0.9920 | 190.04*** |
ν DF Student-t tail thickness | 7.5771 | 1.38 |
Persistence:
0.992
Half-life:
87 days
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