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V-Lab

S&P GSCI Cotton Index GJR-GARCH Volatility Analysis

Volatility prediction for Thursday, October 8th, 2026

1 Day

26.89%

decreased by 0.20%

1 Week

26.87%

decreased by 0.22%

1 Month

26.79%

decreased by 0.30%

Analysis last updated: Wednesday, October 7, 2026 at 11:05 PM UTC

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Date Range:

from

10/07/2024

to

10/07/2026

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 Oct 2, 2026

Model Insight

With persistence 0.993, volatility shocks have a half-life of 106 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

High persistence: persistence 0.993, shock half-life ~106 days
ParamValuet-stat
ωconst0.0164
4.66***
αARCH0.0461
5.44***
βGARCH0.9503
189.64***
γleverage-0.0056
-0.41

0.993

Persistence

106d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0164
4.66***
α

ARCH

Response to squared shocks

0.0461
5.44***
β

GARCH

Volatility persistence

0.9503
189.64***
γ

leverage

Additional response to negative shocks

-0.0056
-0.41

Persistence:

0.993

Half-life:

106 days