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V-Lab

S&P / ASX 200 Volatility Index GJR-GARCH Volatility Analysis

Volatility prediction for Friday, September 18th, 2026

1 Day

104.95%

increased by 5.68%

1 Week

105.51%

increased by 6.24%

1 Month

106.68%

increased by 7.41%

Analysis last updated: Friday, September 18, 2026 at 09:59 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P / ASX 200 Volatility Index GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 2008 to Sep 10, 2026

Model Insight

Volatility shocks decay with a half-life of 6 trading days, meaning a shock loses half its impact after approximately 6 days.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 6-day half-life
ParamValuet-stat
ωconst5.0000
5.60***
αARCH0.1443
3.51***
βGARCH0.7476
22.59***
γleverage-0.0006
-0.01

0.892

Persistence

6d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

5.0000
5.60***
α

ARCH

Response to squared shocks

0.1443
3.51***
β

GARCH

Volatility persistence

0.7476
22.59***
γ

leverage

Additional response to negative shocks

-0.0006
-0.01

Persistence:

0.892

Half-life:

6 days