V-Lab
3M US Treasury CMT 3 Month Zero Slope Spline-GARCH Volatility Analysis
High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful
Volatility prediction for Thursday, September 24th, 2026
1 Day
11.60%
1 Week
11.76%
1 Month
12.38%
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 2, 1990 to Sep 18, 2026Model Insight
With persistence 1.000, volatility shocks have a half-life of 33007 trading days (~131.0 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Zero Slope Spline-GARCH Model
Tap to view equation
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.1840 | 0.82 |
| αARCH | 0.1784 | 0.14 |
| βGARCH | 0.8216 | 0.67 |
| γ1 | -0.2912 | -0.65 |
| γ2 | 0.3858 | 0.62 |
| γ3 | -0.0526 | -0.22 |
| γ4 | -0.2401 | -2.42** |
| γ5 | 0.5889 | 5.25*** |
| γ6 | -0.6782 | -3.72*** |
| γ7 | 0.0963 | 0.78 |
| γ8 | 0.4785 | 2.45** |
| γ9 | -0.3472 | -1.66* |
1.000
Persistence33007d
Half-lifeZero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.1840 | 0.82 |
α ARCH Response to squared shocks | 0.1784 | 0.14 |
β GARCH Volatility persistence | 0.8216 | 0.67 |
| γ1 | -0.2912 | -0.65 |
| γ2 | 0.3858 | 0.62 |
| γ3 | -0.0526 | -0.22 |
| γ4 | -0.2401 | -2.42** |
| γ5 | 0.5889 | 5.25*** |
| γ6 | -0.6782 | -3.72*** |
| γ7 | 0.0963 | 0.78 |
| γ8 | 0.4785 | 2.45** |
| γ9 | -0.3472 | -1.66* |
Persistence:
1.000
Half-life:
33007 days
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