V-Lab
Dow Jones South Africa Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
16.92%
increased by 0.30%
1 Week
16.96%
increased by 0.34%
1 Month
17.10%
increased by 0.48%
Analysis last updated: Saturday, September 12, 2026 at 12:51 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1992 to Sep 10, 2026Model Insight
Volatility shocks decay with a half-life of 34 trading days, meaning a shock loses half its impact after approximately 34 days. Returns follow a Student-t distribution with v = 7.03 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
Shock decay: Shocks decay with a 34-day half-lifev = 7.03 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.2712 | 3.02*** |
| αARCH | 0.0791 | 8.62*** |
| βGARCH | 0.9800 | 146.93*** |
| νDF | 7.0311 | 1.78* |
0.980
Persistence34d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.2712 | 3.02*** |
α ARCH Response to squared shocks | 0.0791 | 8.62*** |
β GARCH Volatility persistence | 0.9800 | 146.93*** |
ν DF Student-t tail thickness | 7.0311 | 1.78* |
Persistence:
0.980
Half-life:
34 days
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