ICE BofA Single-B US High Yield Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, October 23rd, 2026
1 Day
3.31%
1 Week
3.38%
1 Month
3.63%
Analysis last updated: Friday, October 23, 2026 at 02:31 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1997 to Oct 16, 2026Model Insight
With persistence 0.990, volatility shocks have a half-life of 71 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 5.21 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωlong-run | 0.1423 | 1.65* |
| αscore | 0.1903 | 19.18*** |
| βpersistence | 0.9903 | 178.89*** |
| νDF | 5.2057 | 6.70*** |
0.990
Persistence71d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 0.1423 | 1.65* |
α score Weight on the scaled score | 0.1903 | 19.18*** |
β persistence Volatility persistence | 0.9903 | 178.89*** |
ν DF Student-t tail thickness | 5.2057 | 6.70*** |
Persistence:
0.990
Half-life:
71 days
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