V-Lab
Ghana Stock Exchange Composite Index GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 25th, 2026
1 Day
12.56%
decreased by 0.61%
1 Week
12.52%
decreased by 0.65%
1 Month
12.44%
decreased by 0.73%
Analysis last updated: Friday, September 25, 2026 at 09:05 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 4, 2011 to Sep 24, 2026Model Insight
Volatility shocks decay with a half-life of 9 trading days, meaning a shock loses half its impact after approximately 9 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 9-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0447 | 2.94*** |
| αARCH | 0.1402 | 2.84*** |
| βGARCH | 0.8036 | 18.59*** |
| γleverage | -0.0361 | -0.48 |
0.926
Persistence9d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0447 | 2.94*** |
α ARCH Response to squared shocks | 0.1402 | 2.84*** |
β GARCH Volatility persistence | 0.8036 | 18.59*** |
γ leverage Additional response to negative shocks | -0.0361 | -0.48 |
Persistence:
0.926
Half-life:
9 days
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