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V-Lab

CBOT Soybeans Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

21.11%

decreased by 0.10%

1 Week

21.10%

decreased by 0.11%

1 Month

21.08%

decreased by 0.13%

Analysis last updated: Saturday, September 19, 2026 at 04:13 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of CBOT Soybeans S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 15, 2000 to Sep 18, 2026

Model 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 44 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst0.9142
7.69***
αARCH0.0668
8.08***
βGARCH0.9177
108.04***
γi Spline Coefficients
K=2
γ1-0.0063
-2.26**
γ20.0086
2.42**

0.984

Persistence

44d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.9142
7.69***
α

ARCH

Response to squared shocks

0.0668
8.08***
β

GARCH

Volatility persistence

0.9177
108.04***
γi Spline Coefficients
K=2
γ1-0.0063
-2.26**
γ20.0086
2.42**

Persistence:

0.984

Half-life:

44 days