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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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

All

graph of Hevol Services Group Co Ltd GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jul 12, 2019 to Aug 14, 2026

Model 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

ParameterValuet-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