V-Lab
6M US Treasury CMT 6 Month GAS-GARCH Student T Volatility Analysis
Volatility prediction for Thursday, September 24th, 2026
1 Day
16.61%
1 Week
16.68%
1 Month
16.97%
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 0.999, volatility shocks have a half-life of 519 trading days (~2.1 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 4.23 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 4.7361 | 3.07*** |
| αARCH | 0.0773 | 26.10*** |
| βGARCH | 0.9987 | 2,423.94*** |
| νDF | 4.2275 | 18.66*** |
0.999
Persistence519d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 4.7361 | 3.07*** |
α ARCH Response to squared shocks | 0.0773 | 26.10*** |
β GARCH Volatility persistence | 0.9987 | 2,423.94*** |
ν DF Student-t tail thickness | 4.2275 | 18.66*** |
Persistence:
0.999
Half-life:
519 days
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