V-Lab
Hevol Services Group Co Ltd GJR-GARCH Volatility Analysis
Volatility prediction for Thursday, August 20th, 2026
1 Day
52.63%
decreased by 4.16%
1 Week
53.18%
decreased by 3.61%
1 Month
55.10%
decreased by 1.69%
Analysis last updated: Thursday, August 20, 2026 at 06:46 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 12, 2019 to Aug 14, 2026Model Insight
This asset shows a rare inverse leverage effect: positive returns raise next-day volatility 211% more than negative returns. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and uncommon among risky assets.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.3320 | 7.28*** |
α ARCH Response to squared shocks | 0.2239 | 11.15*** |
β GARCH Volatility persistence | 0.8327 | 100.17*** |
γ leverage Additional response to negative shocks | -0.1520 | -5.97*** |
Persistence:
0.981
Half-life:
35 days
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