V-Lab
Vulcan Infrastructure and Power Inc APARCH Volatility Analysis
Volatility prediction for Wednesday, September 16th, 2026
1 Day
91.37%
1 Week
96.74%
1 Month
110.19%
Analysis last updated: Wednesday, September 16, 2026 at 02:43 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 15, 2021 to Sep 11, 2026Model Insight
Volatility shocks decay with a half-life of 9 trading days, meaning a shock loses half its impact after approximately 9 days. The volatility power δ = 1.25 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 | 1.0000 | 0.67 |
| αARCH | 0.0954 | 2.81*** |
| βGARCH | 0.8494 | 12.97*** |
| γleverage | -0.0086 | -0.03 |
| δpower | 1.2517 | 1.91* |
0.928
Persistence9d
Half-lifeAPARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0000 | 0.67 |
α ARCH Response to squared shocks | 0.0954 | 2.81*** |
β GARCH Volatility persistence | 0.8494 | 12.97*** |
γ leverage Additional response to negative shocks | -0.0086 | -0.03 |
δ power Transformation power | 1.2517 | 1.91* |
Persistence:
0.928
Half-life:
9 days
Other Vulcan Infrastructure and Power Inc Analyses
Other APARCH Analyses on Equities