V-Lab
S&P / ASX 200 Volatility Index GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 4th, 2026
1 Day
92.42%
increased by 1.68%
1 Week
95.61%
increased by 4.87%
1 Month
101.92%
increased by 11.18%
Analysis last updated: Friday, September 4, 2026 at 11:27 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 2008 to Aug 27, 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 | 5.58*** |
| αARCH | 0.1446 | 3.51*** |
| βGARCH | 0.7471 | 22.53*** |
| γleverage | -0.0003 | 0.00 |
0.892
Persistence6d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 5.0000 | 5.58*** |
α ARCH Response to squared shocks | 0.1446 | 3.51*** |
β GARCH Volatility persistence | 0.7471 | 22.53*** |
γ leverage Additional response to negative shocks | -0.0003 | 0.00 |
Persistence:
0.892
Half-life:
6 days
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