V-Lab
Chicago SRW Wheat Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
32.92%
decreased by 0.25%
1 Week
32.88%
decreased by 0.29%
1 Month
32.74%
decreased by 0.43%
Analysis last updated: Saturday, September 19, 2026 at 04:13 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 17, 2000 to Sep 18, 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 53 trading days.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0679 | 10.21*** |
| αARCH | 0.0495 | 6.96*** |
| βGARCH | 0.9375 | 107.30*** |
Spline Coefficients
K=1
| γ1 | 0.0002 | 0.74 |
0.987
Persistence53d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0679 | 10.21*** |
α ARCH Response to squared shocks | 0.0495 | 6.96*** |
β GARCH Volatility persistence | 0.9375 | 107.30*** |
Spline Coefficients
K=1
| γ1 | 0.0002 | 0.74 |
Persistence:
0.987
Half-life:
53 days
Other Chicago SRW Wheat Analyses
Other Zero Slope Spline-GARCH Analyses on Commodities