V-Lab
Powerhouse Energy Group PLC GJR-GARCH Volatility Analysis
High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful
Volatility prediction for Monday, July 27th, 2026
1 Day
54.74%
1 Week
57.81%
1 Month
68.72%
Analysis last updated: Sunday, July 26, 2026 at 06:32 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Feb 16, 2007 to Jul 24, 2026Model Insight
With persistence 1.000, volatility shocks have a half-life of 1386294 trading days (~5501.2 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 101% more than positive returns
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.6846 | 8.03*** |
α ARCH Response to squared shocks | 0.0621 | 11.41*** |
β GARCH Volatility persistence | 0.9067 | 159.35*** |
γ leverage Additional response to negative shocks | 0.0625 | 6.76*** |
Persistence:
1.000
Half-life:
1386294 days
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