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V-Lab

S&P GSCI Grains Spot Index MF2-GARCH Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

19.28%

decreased by 0.17%

1 Week

19.31%

decreased by 0.14%

1 Month

19.43%

decreased by 0.02%

Analysis last updated: Saturday, September 19, 2026 at 12:03 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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graph of S&P GSCI Grains Spot Index MF2-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 18, 2026

Model Insight

This asset shows a rare inverse leverage effect: positive returns raise next-day volatility 35% more than negative returns. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and uncommon among risky assets.

σ

MF2-GARCH Model

Tap to view equation

Inverse leverage: Positive returns increase volatility 35% more than negative returns
ParamValuet-stat
mwindow66
αARCH0.0726
9.09***
βGARCH0.9094
94.40***
γleverage-0.0187
-1.99**
λ₁tau intercept0.0018
0.88
λ₂forecast adj.0.0121
1.83*
λ₃tau persistence0.9870
134.17***

0.973

Persistence

25d

Half-life
σ

MF2-GARCH Model

Tap to view equation

ParameterValuet-statistic
m

window

Rolling window length

66
α

ARCH

Response to squared shocks

0.0726
9.09***
β

GARCH

Volatility persistence

0.9094
94.40***
γ

leverage

Additional response to negative shocks

-0.0187
-1.99**
λ₁

tau intercept

Baseline long-term coefficient

0.0018
0.88
λ₂

forecast adj.

Forecast performance sensitivity

0.0121
1.83*
λ₃

tau persistence

Long-term factor persistence

0.9870
134.17***

Persistence:

0.973

Half-life:

25 days