V-Lab
S&P GSCI Coffee Index MF2-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
33.39%
1 Week
33.99%
1 Month
35.14%
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
This asset shows a rare inverse leverage effect: volatility responds almost entirely to positive returns, rising far more after gains than after losses. This is the reverse of the usual leverage effect, rare among risky assets.
MF2-GARCH Model
Tap to view equation
| Param | Value | t-stat |
|---|---|---|
| mwindow | 56 | |
| αARCH | 0.1085 | 7.66*** |
| βGARCH | 0.8852 | 43.43*** |
| γleverage | -0.0937 | -6.29*** |
| λ₁tau intercept | 0.0224 | 1.74* |
| λ₂forecast adj. | 0.0164 | 2.51** |
| λ₃tau persistence | 0.9790 | 113.12*** |
0.947
Persistence13d
Half-lifeMF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 56 | |
α ARCH Response to squared shocks | 0.1085 | 7.66*** |
β GARCH Volatility persistence | 0.8852 | 43.43*** |
γ leverage Additional response to negative shocks | -0.0937 | -6.29*** |
λ₁ tau intercept Baseline long-term coefficient | 0.0224 | 1.74* |
λ₂ forecast adj. Forecast performance sensitivity | 0.0164 | 2.51** |
λ₃ tau persistence Long-term factor persistence | 0.9790 | 113.12*** |
Persistence:
0.947
Half-life:
13 days
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