V-Lab
Vinacomin Vang Danh Coal GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
26.23%
decreased by 0.49%
1 Week
26.88%
increased by 0.16%
1 Month
29.20%
increased by 2.48%
Analysis last updated: Friday, September 11, 2026 at 09:38 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Aug 10, 2011 to Sep 4, 2026Model Insight
Volatility shocks decay with a half-life of 67 trading days, meaning a shock loses half its impact after approximately 67 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 67-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0978 | 3.41*** |
| αARCH | 0.0780 | 3.43*** |
| βGARCH | 0.9292 | 87.85*** |
| γleverage | -0.0348 | -1.10 |
0.990
Persistence67d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0978 | 3.41*** |
α ARCH Response to squared shocks | 0.0780 | 3.43*** |
β GARCH Volatility persistence | 0.9292 | 87.85*** |
γ leverage Additional response to negative shocks | -0.0348 | -1.10 |
Persistence:
0.990
Half-life:
67 days
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