V-Lab
S&P GSCI Agricultural Spot Index MF2-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
16.51%
increased by 0.02%
1 Week
16.54%
increased by 0.05%
1 Month
16.56%
increased by 0.07%
Analysis last updated: Saturday, September 19, 2026 at 12:03 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
Volatility shocks decay with a half-life of 30 trading days, meaning a shock loses half its impact after approximately 30 days.
σ
MF2-GARCH Model
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Shock decay: Shocks decay with a 30-day half-life
| Param | Value | t-stat |
|---|---|---|
| mwindow | 61 | |
| αARCH | 0.0659 | 8.75*** |
| βGARCH | 0.9183 | 101.15*** |
| γleverage | -0.0140 | -1.61 |
| λ₁tau intercept | 0.0013 | 1.03 |
| λ₂forecast adj. | 0.0097 | 1.83* |
| λ₃tau persistence | 0.9893 | 164.06*** |
0.977
Persistence30d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 61 | |
α ARCH Response to squared shocks | 0.0659 | 8.75*** |
β GARCH Volatility persistence | 0.9183 | 101.15*** |
γ leverage Additional response to negative shocks | -0.0140 | -1.61 |
λ₁ tau intercept Baseline long-term coefficient | 0.0013 | 1.03 |
λ₂ forecast adj. Forecast performance sensitivity | 0.0097 | 1.83* |
λ₃ tau persistence Long-term factor persistence | 0.9893 | 164.06*** |
Persistence:
0.977
Half-life:
30 days
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