V-Lab
Samsung Electronics Co Ltd AGARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
79.19%
decreased by 2.19%
1 Week
78.92%
decreased by 2.46%
1 Month
77.83%
decreased by 3.55%
Analysis last updated: Friday, September 11, 2026 at 08:31 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 3, 1990 to Sep 4, 2026Model Insight
With persistence 0.995, volatility shocks have a half-life of 145 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Asymmetry: negative returns raise volatility more
σ
AGARCH Model
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High persistence: persistence 0.995, shock half-life ~145 daysAsymmetry: negative returns raise volatility more
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0258 | 2.81*** |
| αARCH | 0.0494 | 9.72*** |
| βGARCH | 0.9459 | 176.83*** |
| γleverage | 0.3290 | 2.38** |
0.995
Persistence145d
Half-lifeσ
AGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0258 | 2.81*** |
α ARCH Response to squared shocks | 0.0494 | 9.72*** |
β GARCH Volatility persistence | 0.9459 | 176.83*** |
γ leverage Additional response to negative shocks | 0.3290 | 2.38** |
Persistence:
0.995
Half-life:
145 days
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