V-Lab
1Y US Treasury 1 Year Zero Coupon Yield Continuously Compounded 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 Monday, September 21st, 2026
1 Day
19.39%
1 Week
19.65%
1 Month
20.64%
Analysis last updated: Wednesday, September 23, 2026 at 03:06 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 8886 trading days (~35.3 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 | 0.9974 | 2.20** |
| αARCH | 0.0861 | 6.89*** |
| βGARCH | 0.9139 | 73.38*** |
| γ1 | -0.2682 | -1.64 |
| γ2 | 0.3432 | 1.51 |
| γ3 | -0.1037 | -0.94 |
| γ4 | 0.1768 | 2.40** |
| γ5 | -0.3256 | -3.46*** |
| γ6 | 0.1595 | 1.14 |
| γ7 | 0.1212 | 0.93 |
| γ8 | -0.1370 | -1.93* |
1.000
Persistence8886d
Half-lifeZero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.9974 | 2.20** |
α ARCH Response to squared shocks | 0.0861 | 6.89*** |
β GARCH Volatility persistence | 0.9139 | 73.38*** |
| γ1 | -0.2682 | -1.64 |
| γ2 | 0.3432 | 1.51 |
| γ3 | -0.1037 | -0.94 |
| γ4 | 0.1768 | 2.40** |
| γ5 | -0.3256 | -3.46*** |
| γ6 | 0.1595 | 1.14 |
| γ7 | 0.1212 | 0.93 |
| γ8 | -0.1370 | -1.93* |
Persistence:
1.000
Half-life:
8886 days
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