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V-Lab

S&P GSCI Copper Spot Index GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, July 21st, 2026

1 Day

18.25%

decreased by 0.20%

1 Week

18.36%

decreased by 0.09%

1 Month

18.79%

increased by 0.34%

Analysis last updated: Monday, July 20, 2026 at 11:09 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P GSCI Copper Spot 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 Jul 17, 2026

Model Insight

This asset exhibits a modest leverage effect: negative returns increase next-day volatility 29% more than equivalent positive returns.

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0235
17.24***
α

ARCH

Response to squared shocks

0.0415
16.28***
β

GARCH

Volatility persistence

0.9411
484.36***
γ

leverage

Additional response to negative shocks

0.0122
3.01***

Persistence:

0.989

Half-life:

61 days