US Dollar to Japanese Yen GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, November 9th, 2026
1 Day
4.33%
1 Week
4.39%
1 Month
4.63%
Analysis last updated: Sunday, November 8, 2026 at 03:13 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Nov 6, 2026Model Insight
With persistence 0.997, volatility shocks have a half-life of 209 trading days (~0.8 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 3.63 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωlong-run | 0.4246 | 1.06 |
| αscore | 0.0385 | 18.61*** |
| βpersistence | 0.9967 | 320.89*** |
| νDF | 3.6265 | 7.72*** |
0.997
Persistence209d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 0.4246 | 1.06 |
α score Weight on the scaled score | 0.0385 | 18.61*** |
β persistence Volatility persistence | 0.9967 | 320.89*** |
ν DF Student-t tail thickness | 3.6265 | 7.72*** |
Persistence:
0.997
Half-life:
209 days
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