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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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Chicago SRW Wheat GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jul 17, 2000 to Sep 18, 2026

Model 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
ParamValuet-stat
ωconst4.0052
2.45**
αARCH0.0470
6.49***
βGARCH0.9886
200.61***
νDF9.4022
0.80

0.989

Persistence

60d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-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