V-Lab
Chicago SRW Wheat GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
33.13%
decreased by 0.10%
1 Week
33.10%
decreased by 0.13%
1 Month
32.99%
decreased by 0.24%
Analysis last updated: Saturday, September 19, 2026 at 04:12 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
Volatility shocks decay with a half-life of 60 trading days, meaning a shock loses half its impact after approximately 60 days. Returns follow a Student-t distribution with v = 9.40 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
Shock decay: Shocks decay with a 60-day half-lifev = 9.40 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 4.0052 | 2.45** |
| αARCH | 0.0470 | 6.49*** |
| βGARCH | 0.9886 | 200.61*** |
| νDF | 9.4022 | 0.80 |
0.989
Persistence60d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 4.0052 | 2.45** |
α ARCH Response to squared shocks | 0.0470 | 6.49*** |
β GARCH Volatility persistence | 0.9886 | 200.61*** |
ν DF Student-t tail thickness | 9.4022 | 0.80 |
Persistence:
0.989
Half-life:
60 days
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