20Y US Treasury CMT 20 Year GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, November 9th, 2026
1 Day
15.29%
1 Week
15.33%
1 Month
15.50%
Analysis last updated: Saturday, November 7, 2026 at 05:00 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 1, 1993 to Nov 6, 2026Model Insight
With persistence 0.997, volatility shocks have a half-life of 220 trading days (~0.9 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 18.25 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωlong-run | 1.8702 | 2.92*** |
| αscore | 0.0464 | 9.72*** |
| βpersistence | 0.9969 | 671.73*** |
| νDF | 18.2492 | 0.63 |
0.997
Persistence220d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 1.8702 | 2.92*** |
α score Weight on the scaled score | 0.0464 | 9.72*** |
β persistence Volatility persistence | 0.9969 | 671.73*** |
ν DF Student-t tail thickness | 18.2492 | 0.63 |
Persistence:
0.997
Half-life:
220 days
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