V-Lab
S&P GSCI Sugar Index APARCH Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
31.76%
increased by 0.06%
1 Week
31.75%
increased by 0.05%
1 Month
31.73%
increased by 0.03%
Analysis last updated: Saturday, September 12, 2026 at 12:56 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 11, 2026Model Insight
With persistence 0.996, volatility shocks have a half-life of 163 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
σ
APARCH Model
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High persistence: persistence 0.996, shock half-life ~163 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0158 | 3.24*** |
| αARCH | 0.0297 | 6.75*** |
| βGARCH | 0.9665 | 229.47*** |
| γleverage | -0.0072 | -0.14 |
| δpower | 1.9568 | 9.87*** |
0.996
Persistence163d
Half-lifeσ
APARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0158 | 3.24*** |
α ARCH Response to squared shocks | 0.0297 | 6.75*** |
β GARCH Volatility persistence | 0.9665 | 229.47*** |
γ leverage Additional response to negative shocks | -0.0072 | -0.14 |
δ power Transformation power | 1.9568 | 9.87*** |
Persistence:
0.996
Half-life:
163 days
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