V-Lab
Sam Holdings Corporation GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
20.71%
decreased by 0.71%
1 Week
22.39%
increased by 0.97%
1 Month
27.35%
increased by 5.93%
Analysis last updated: Friday, September 11, 2026 at 09:46 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Mar 21, 2007 to Sep 4, 2026Model Insight
Volatility shocks decay with a half-life of 27 trading days, meaning a shock loses half its impact after approximately 27 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 27-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.1904 | 4.81*** |
| αARCH | 0.1455 | 4.80*** |
| βGARCH | 0.8216 | 51.56*** |
| γleverage | 0.0157 | 0.29 |
0.975
Persistence27d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1904 | 4.81*** |
α ARCH Response to squared shocks | 0.1455 | 4.80*** |
β GARCH Volatility persistence | 0.8216 | 51.56*** |
γ leverage Additional response to negative shocks | 0.0157 | 0.29 |
Persistence:
0.975
Half-life:
27 days
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