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S&P / ASX 200 Volatility Index EGARCH Volatility Analysis

Volatility prediction for Friday, September 4th, 2026

1 Day

96.50%

increased by 2.67%

1 Week

99.11%

increased by 5.28%

1 Month

104.23%

increased by 10.40%

Analysis last updated: Friday, September 4, 2026 at 11:27 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P / ASX 200 Volatility Index EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 2008 to Aug 27, 2026

Model Insight

Volatility shocks decay with a half-life of 5 trading days, meaning a shock loses half its impact after approximately 5 days.

σ

EGARCH Model

Tap to view equation

Shock decay: Shocks decay with a 5-day half-life
ParamValuet-stat
ωconst0.4920
4.62***
αARCH0.2887
5.15***
βGARCH0.8720
31.10***
γleverage0.0246
0.39

0.872

Persistence

5d

Half-life
σ

EGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.4920
4.62***
α

ARCH

Response to squared shocks

0.2887
5.15***
β

GARCH

Volatility persistence

0.8720
31.10***
γ

leverage

Additional response to negative shocks

0.0246
0.39

Persistence:

0.872

Half-life:

5 days