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V-Lab

S&P GSCI Cotton Index GJR-GARCH Volatility Analysis

Volatility prediction for Monday, August 31st, 2026

1 Day

23.71%

decreased by 0.24%

1 Week

23.73%

decreased by 0.22%

1 Month

23.80%

decreased by 0.15%

Analysis last updated: Friday, August 28, 2026 at 11:10 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P GSCI Cotton Index GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Aug 28, 2026

Model Insight

With persistence 0.993, volatility shocks have a half-life of 105 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0166
4.67***
α

ARCH

Response to squared shocks

0.0460
5.43***
β

GARCH

Volatility persistence

0.9501
188.55***
γ

leverage

Additional response to negative shocks

-0.0054
-0.39

Persistence:

0.993

Half-life:

105 days