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V-Lab

British Pound GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 29th, 2026

1 Day

5.00%

decreased by 0.06%

1 Week

5.03%

decreased by 0.03%

1 Month

5.16%

increased by 0.10%

Analysis last updated: Monday, September 28, 2026 at 07:10 PM UTC

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graph of British Pound GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 25, 2026

Model Insight

With persistence 0.995, volatility shocks have a half-life of 128 trading days (~0.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

σ

GJR-GARCH Model

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High persistence: persistence 0.995, shock half-life ~128 days
ParamValuet-stat
ωconst0.0012
3.80***
αARCH0.0234
2.68***
βGARCH0.9653
194.74***
γleverage0.0119
0.82

0.995

Persistence

128d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0012
3.80***
α

ARCH

Response to squared shocks

0.0234
2.68***
β

GARCH

Volatility persistence

0.9653
194.74***
γ

leverage

Additional response to negative shocks

0.0119
0.82

Persistence:

0.995

Half-life:

128 days