V-Lab
1Y US Treasury CMT 1 Year GAS-GARCH Student T Volatility Analysis
Volatility prediction for Thursday, September 24th, 2026
1 Day
18.20%
1 Week
18.28%
1 Month
18.56%
Analysis last updated: Thursday, September 24, 2026 at 03:00 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Sep 18, 2026Model Insight
With persistence 0.998, volatility shocks have a half-life of 321 trading days (~1.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 4.67 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 3.7920 | 2.66*** |
| αARCH | 0.0683 | 21.38*** |
| βGARCH | 0.9978 | 1,318.15*** |
| νDF | 4.6726 | 13.30*** |
0.998
Persistence321d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 3.7920 | 2.66*** |
α ARCH Response to squared shocks | 0.0683 | 21.38*** |
β GARCH Volatility persistence | 0.9978 | 1,318.15*** |
ν DF Student-t tail thickness | 4.6726 | 13.30*** |
Persistence:
0.998
Half-life:
321 days
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