ICE BofA US Corporate Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, October 23rd, 2026
1 Day
4.79%
1 Week
4.79%
1 Month
4.79%
Analysis last updated: Friday, October 23, 2026 at 02:30 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Oct 16, 2026Model Insight
With persistence 0.992, volatility shocks have a half-life of 88 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 = 8.91 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωlong-run | 0.0908 | 2.73*** |
| αscore | 0.0377 | 9.10*** |
| βpersistence | 0.9921 | 314.17*** |
| νDF | 8.9051 | 1.05 |
0.992
Persistence88d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 0.0908 | 2.73*** |
α score Weight on the scaled score | 0.0377 | 9.10*** |
β persistence Volatility persistence | 0.9921 | 314.17*** |
ν DF Student-t tail thickness | 8.9051 | 1.05 |
Persistence:
0.992
Half-life:
88 days
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