V-Lab
S&P GSCI Softs Spot Index Spline-GARCH Volatility Analysis
Volatility prediction for Wednesday, September 9th, 2026
1 Day
23.83%
decreased by 0.39%
1 Week
23.90%
decreased by 0.32%
1 Month
24.15%
decreased by 0.07%
Analysis last updated: Tuesday, September 8, 2026 at 11:32 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 17, 1995 to Sep 8, 2026Model Insight
This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 37 trading days.
τ
Spline-GARCH Model
Tap to view equation
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.7694 | 8.62*** |
| αARCH | 0.0454 | 7.01*** |
| βGARCH | 0.9361 | 102.86*** |
Spline Coefficients
K=2
| γ1 | -0.0051 | -3.12*** |
| γ2 | 0.0103 | 3.44*** |
0.981
Persistence37d
Half-lifeτ
Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.7694 | 8.62*** |
α ARCH Response to squared shocks | 0.0454 | 7.01*** |
β GARCH Volatility persistence | 0.9361 | 102.86*** |
Spline Coefficients
K=2
| γ1 | -0.0051 | -3.12*** |
| γ2 | 0.0103 | 3.44*** |
Persistence:
0.981
Half-life:
37 days
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