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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%

unchanged at 0.00%

1 Week

19.65%

increased by 0.26%

1 Month

20.64%

increased by 1.25%

Analysis last updated: Wednesday, September 23, 2026 at 03:06 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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graph of 1Y US Treasury 1 Year Zero Coupon Yield Continuously Compounded S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 18, 2026

Model 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.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

High persistence: persistence 1.000, shock half-life ~8886 days
ParamValuet-stat
ωconst0.9974
2.20**
αARCH0.0861
6.89***
βGARCH0.9139
73.38***
γi Spline Coefficients
K=8
γ1-0.2682
-1.64
γ20.3432
1.51
γ3-0.1037
-0.94
γ40.1768
2.40**
γ5-0.3256
-3.46***
γ60.1595
1.14
γ70.1212
0.93
γ8-0.1370
-1.93*

1.000

Persistence

8886d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-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***
γi Spline Coefficients
K=8
γ1-0.2682
-1.64
γ20.3432
1.51
γ3-0.1037
-0.94
γ40.1768
2.40**
γ5-0.3256
-3.46***
γ60.1595
1.14
γ70.1212
0.93
γ8-0.1370
-1.93*

Persistence:

1.000

Half-life:

8886 days