V-Lab
Hevol Services Group Co Ltd GJR-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 8th, 2026
1 Day
43.59%
decreased by 1.44%
1 Week
44.62%
decreased by 0.41%
1 Month
48.06%
increased by 3.03%
Analysis last updated: Tuesday, September 8, 2026 at 08:16 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 12, 2019 to Aug 28, 2026Model Insight
Volatility shocks decay with a half-life of 35 trading days, meaning a shock loses half its impact after approximately 35 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 35-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.3312 | 1.82* |
| αARCH | 0.2227 | 2.78*** |
| βGARCH | 0.8333 | 25.20*** |
| γleverage | -0.1512 | -1.50 |
0.980
Persistence35d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.3312 | 1.82* |
α ARCH Response to squared shocks | 0.2227 | 2.78*** |
β GARCH Volatility persistence | 0.8333 | 25.20*** |
γ leverage Additional response to negative shocks | -0.1512 | -1.50 |
Persistence:
0.980
Half-life:
35 days
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