V-Lab
30Y US Treasury CMT 30 Year Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Thursday, September 24th, 2026
1 Day
15.13%
increased by 1.44%
1 Week
15.25%
increased by 1.56%
1 Month
15.71%
increased by 2.02%
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 0.995, volatility shocks have a half-life of 151 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
High persistence: persistence 0.995, shock half-life ~151 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.6642 | 6.57*** |
| αARCH | 0.0448 | 8.36*** |
| βGARCH | 0.9506 | 173.40*** |
Spline Coefficients
K=1
| γ1 | -0.0006 | -3.11*** |
0.995
Persistence151d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.6642 | 6.57*** |
α ARCH Response to squared shocks | 0.0448 | 8.36*** |
β GARCH Volatility persistence | 0.9506 | 173.40*** |
Spline Coefficients
K=1
| γ1 | -0.0006 | -3.11*** |
Persistence:
0.995
Half-life:
151 days
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