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HSI Volatility Index EGARCH Volatility Analysis

Volatility prediction for Friday, September 25th, 2026

1 Day

63.35%

decreased by 2.09%

1 Week

65.76%

increased by 0.32%

1 Month

73.00%

increased by 7.56%

Analysis last updated: Friday, September 25, 2026 at 09:00 PM UTC

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graph of HSI Volatility Index EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jul 16, 2010 to Sep 24, 2026

Model Insight

This asset shows a rare inverse leverage effect: volatility responds almost entirely to positive returns, rising far more after gains than after losses. This is the reverse of the usual leverage effect, rare among risky assets.

σ

EGARCH Model

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Inverse leverage: volatility responds almost entirely to positive returns
ParamValuet-stat
ωconst0.2077
1.58
αARCH0.1234
3.20***
βGARCH0.9391
38.08***
γleverage0.1290
2.67***

0.939

Persistence

11d

Half-life
σ

EGARCH Model

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ParameterValuet-statistic
ω

const

Unconditional variance weight

0.2077
1.58
α

ARCH

Response to squared shocks

0.1234
3.20***
β

GARCH

Volatility persistence

0.9391
38.08***
γ

leverage

Additional response to negative shocks

0.1290
2.67***

Persistence:

0.939

Half-life:

11 days