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V-Lab

S&P GSCI Copper Spot Index AGARCH Volatility Analysis

Volatility prediction for Thursday, August 20th, 2026

1 Day

15.34%

decreased by 0.24%

1 Week

15.57%

decreased by 0.01%

1 Month

16.40%

increased by 0.82%

Analysis last updated: Wednesday, August 19, 2026 at 11:09 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P GSCI Copper Spot Index AGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Aug 14, 2026

Model Insight

The news-impact curve is shifted (γ = 0.17) so that negative returns raise next-day volatility more than positive returns of the same size. The gap is largest for small shocks and narrows for larger ones.

σ

AGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0248
17.28***
α

ARCH

Response to squared shocks

0.0506
31.54***
β

GARCH

Volatility persistence

0.9368
485.13***
γ

leverage

Additional response to negative shocks

0.1652
5.38***

Persistence:

0.987

Half-life:

55 days