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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%

decreased by 1.07%

1 Week

57.81%

increased by 2.00%

1 Month

68.72%

increased by 12.91%

Analysis last updated: Sunday, July 26, 2026 at 06:32 AM UTC

Date Range:

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to

6M ·

1Y ·

2Y ·

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10Y ·

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graph of Powerhouse Energy Group PLC GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Feb 16, 2007 to Jul 24, 2026

Model 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

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-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