V-Lab
Sam Holdings Corporation APARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
21.10%
1 Week
22.87%
1 Month
28.16%
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 19 trading days, meaning a shock loses half its impact after approximately 19 days. The volatility power δ = 1.46 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
APARCH Model
Tap to view equation
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.1515 | 4.82*** |
| αARCH | 0.1570 | 9.73*** |
| βGARCH | 0.8300 | 46.90*** |
| γleverage | 0.0194 | 0.36 |
| δpower | 1.4552 | 6.41*** |
0.964
Persistence19d
Half-lifeAPARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1515 | 4.82*** |
α ARCH Response to squared shocks | 0.1570 | 9.73*** |
β GARCH Volatility persistence | 0.8300 | 46.90*** |
γ leverage Additional response to negative shocks | 0.0194 | 0.36 |
δ power Transformation power | 1.4552 | 6.41*** |
Persistence:
0.964
Half-life:
19 days
Other Sam Holdings Corporation Analyses
Other APARCH Analyses on International Equities