V-Lab
SK Hynix Inc GJR-GARCH Volatility Analysis
Volatility prediction for Wednesday, October 7th, 2026
1 Day
77.40%
decreased by 0.47%
1 Week
77.33%
decreased by 0.54%
1 Month
77.03%
decreased by 0.84%
Analysis last updated: Wednesday, October 7, 2026 at 07:57 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Dec 26, 1996 to Oct 2, 2026Model Insight
With persistence 0.997, volatility shocks have a half-life of 230 trading days (~0.9 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
σ
GJR-GARCH Model
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High persistence: persistence 0.997, shock half-life ~230 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0479 | 3.26*** |
| αARCH | 0.0318 | 4.85*** |
| βGARCH | 0.9528 | 196.66*** |
| γleverage | 0.0247 | 1.87* |
0.997
Persistence230d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0479 | 3.26*** |
α ARCH Response to squared shocks | 0.0318 | 4.85*** |
β GARCH Volatility persistence | 0.9528 | 196.66*** |
γ leverage Additional response to negative shocks | 0.0247 | 1.87* |
Persistence:
0.997
Half-life:
230 days
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