S&P SmallCap 600 Index GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, November 2nd, 2026
1 Day
14.87%
1 Week
14.98%
1 Month
15.42%
Analysis last updated: Friday, October 30, 2026 at 11:05 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Oct 30, 2026Model Insight
With persistence 0.991, volatility shocks have a half-life of 81 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 = 10.76 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωlong-run | 1.6968 | 2.16** |
| αscore | 0.0834 | 10.19*** |
| βpersistence | 0.9915 | 220.57*** |
| νDF | 10.7642 | 1.27 |
0.991
Persistence81d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 1.6968 | 2.16** |
α score Weight on the scaled score | 0.0834 | 10.19*** |
β persistence Volatility persistence | 0.9915 | 220.57*** |
ν DF Student-t tail thickness | 10.7642 | 1.27 |
Persistence:
0.991
Half-life:
81 days
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