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
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 2008 to Sep 10, 2026Model 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
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Shock decay: Shocks decay with a 6-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 5.0000 | 5.60*** |
| αARCH | 0.1443 | 3.51*** |
| βGARCH | 0.7476 | 22.59*** |
| γleverage | -0.0006 | -0.01 |
0.892
Persistence6d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-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
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