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V-Lab

20Y US Treasury CMT 20 Year GAS-GARCH Student T Volatility Analysis

Volatility prediction for Monday, November 9th, 2026

1 Day

15.29%

decreased by 0.34%

1 Week

15.33%

decreased by 0.30%

1 Month

15.50%

decreased by 0.13%

Analysis last updated: Saturday, November 7, 2026 at 05:00 AM UTC

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Date Range:

from

11/06/2024

to

11/06/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of 20Y US Treasury CMT 20 Year GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 1, 1993 to Nov 6, 2026

Model Insight

With persistence 0.997, volatility shocks have a half-life of 220 trading days (~0.9 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 18.25 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

High persistence: persistence 0.997, shock half-life ~220 daysv = 18.25 · fat tails
ParamValuet-stat
ωlong-run1.8702
2.92***
αscore0.0464
9.72***
βpersistence0.9969
671.73***
νDF18.2492
0.63

0.997

Persistence

220d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

long-run

Long-run variance given a price move

1.8702
2.92***
α

score

Weight on the scaled score

0.0464
9.72***
β

persistence

Volatility persistence

0.9969
671.73***
ν

DF

Student-t tail thickness

18.2492
0.63

Persistence:

0.997

Half-life:

220 days