V-Lab
SEI Select Small CAP ETF GAS-GARCH Student T Volatility Analysis
Volatility prediction for Wednesday, August 12th, 2026
1 Day
20.14%
decreased by 0.55%
1 Week
20.28%
decreased by 0.41%
1 Month
20.62%
decreased by 0.07%
Analysis last updated: Tuesday, August 11, 2026 at 09:58 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 10, 2024 to Aug 7, 2026Model Insight
Volatility shocks decay with a half-life of 9 trading days, meaning a shock loses half its impact after approximately 9 days. Returns follow a Student-t distribution with v = 5.45 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.7736 | 3.30*** |
α ARCH Response to squared shocks | 0.0358 | 2.26** |
β GARCH Volatility persistence | 0.9294 | 53.36*** |
ν DF Student-t tail thickness | 5.4513 | 0.42 |
Persistence:
0.929
Half-life:
9 days
Other SEI Select Small CAP ETF Analyses
Other GAS-GARCH Student T Analyses on ETFs