V-Lab
HSI Volatility Index GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 25th, 2026
1 Day
64.11%
decreased by 0.78%
1 Week
67.05%
increased by 2.16%
1 Month
73.69%
increased by 8.80%
Analysis last updated: Friday, September 25, 2026 at 09:00 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 16, 2010 to Sep 24, 2026Model 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
GJR-GARCH Model
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Inverse leverage: volatility responds almost entirely to positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 2.1637 | 3.02*** |
| αARCH | 0.1410 | 4.26*** |
| βGARCH | 0.8463 | 33.67*** |
| γleverage | -0.1380 | -3.50*** |
0.918
Persistence8d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.1637 | 3.02*** |
α ARCH Response to squared shocks | 0.1410 | 4.26*** |
β GARCH Volatility persistence | 0.8463 | 33.67*** |
γ leverage Additional response to negative shocks | -0.1380 | -3.50*** |
Persistence:
0.918
Half-life:
8 days
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