V-Lab
Woolworths Holdings Ltd/South Africa GJR-GARCH Volatility Analysis
Volatility prediction for Tuesday, August 25th, 2026
1 Day
28.20%
decreased by 0.32%
1 Week
28.43%
decreased by 0.09%
1 Month
29.21%
increased by 0.69%
Analysis last updated: Tuesday, August 25, 2026 at 08:13 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 3, 1997 to Aug 21, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 102% more than equivalent positive returns.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0967 | 18.01*** |
α ARCH Response to squared shocks | 0.0356 | 12.79*** |
β GARCH Volatility persistence | 0.9239 | 379.91*** |
γ leverage Additional response to negative shocks | 0.0362 | 6.72*** |
Persistence:
0.978
Half-life:
31 days
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