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Hevol Services Group Co Ltd GJR-GARCH Volatility Analysis

Volatility prediction for Friday, September 18th, 2026

1 Day

94.00%

increased by 7.90%

1 Week

93.48%

increased by 7.38%

1 Month

91.58%

increased by 5.48%

Analysis last updated: Friday, September 18, 2026 at 07:20 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 Sep 17, 2026

Model Insight

Volatility shocks decay with a half-life of 45 trading days, meaning a shock loses half its impact after approximately 45 days.

σ

GJR-GARCH Model

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Shock decay: Shocks decay with a 45-day half-life
ParamValuet-stat
ωconst0.3394
1.80*
αARCH0.2397
2.87***
βGARCH0.8275
23.97***
γleverage-0.1648
-1.57

0.985

Persistence

45d

Half-life
σ

GJR-GARCH Model

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ParameterValuet-statistic
ω

const

Unconditional variance weight

0.3394
1.80*
α

ARCH

Response to squared shocks

0.2397
2.87***
β

GARCH

Volatility persistence

0.8275
23.97***
γ

leverage

Additional response to negative shocks

-0.1648
-1.57

Persistence:

0.985

Half-life:

45 days