V-Lab
SEI Select Small CAP ETF GJR-GARCH Volatility Analysis
Volatility prediction for Wednesday, September 9th, 2026
1 Day
19.06%
unchanged at 0.00%
1 Week
19.37%
increased by 0.31%
1 Month
20.20%
increased by 1.14%
Analysis last updated: Tuesday, September 8, 2026 at 10:28 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 10, 2024 to Sep 4, 2026Model Insight
Volatility shocks decay with a half-life of 11 trading days, meaning a shock loses half its impact after approximately 11 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 11-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.1128 | 0.64 |
| αARCH | 0.0000 | 0.00 |
| βGARCH | 0.8862 | 10.50*** |
| γleverage | 0.1064 | 0.61 |
0.939
Persistence11d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1128 | 0.64 |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8862 | 10.50*** |
γ leverage Additional response to negative shocks | 0.1064 | 0.61 |
Persistence:
0.939
Half-life:
11 days
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