20Y US Treasury CMT 20 Year Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, November 9th, 2026
1 Day
16.10%
decreased by 0.27%
1 Week
16.18%
decreased by 0.19%
1 Month
16.51%
increased by 0.14%
Analysis last updated: Saturday, November 7, 2026 at 04:01 AM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 1, 1993 to Nov 6, 2026Model Insight
With persistence 0.998, volatility shocks have a half-life of 355 trading days (~1.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
τ
Zero Slope Spline-GARCH Model
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High persistence: persistence 0.998, shock half-life ~355 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.9004 | 4.49*** |
| αARCH | 0.0432 | 8.14*** |
| βGARCH | 0.9549 | 174.54*** |
Spline Coefficients
K=1
| γ1 | -0.0004 | -1.24 |
0.998
Persistence355d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.9004 | 4.49*** |
α ARCH Response to squared shocks | 0.0432 | 8.14*** |
β GARCH Volatility persistence | 0.9549 | 174.54*** |
Spline Coefficients
K=1
| γ1 | -0.0004 | -1.24 |
Persistence:
0.998
Half-life:
355 days
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