V-Lab
Dow Jones South Africa Index GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
16.12%
increased by 0.51%
1 Week
16.22%
increased by 0.61%
1 Month
16.58%
increased by 0.97%
Analysis last updated: Saturday, September 12, 2026 at 12:48 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
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 253% more than equivalent positive returns.
σ
GJR-GARCH Model
Tap to view equation
Leverage: Negative returns increase volatility 253% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0295 | 5.93*** |
| αARCH | 0.0362 | 3.70*** |
| βGARCH | 0.8959 | 92.71*** |
| γleverage | 0.0916 | 3.82*** |
0.978
Persistence31d
Half-lifeσ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0295 | 5.93*** |
α ARCH Response to squared shocks | 0.0362 | 3.70*** |
β GARCH Volatility persistence | 0.8959 | 92.71*** |
γ leverage Additional response to negative shocks | 0.0916 | 3.82*** |
Persistence:
0.978
Half-life:
31 days
Other Dow Jones South Africa Index Analyses
Other GJR-GARCH Analyses on Equity Indices