SEI Select Small CAP ETF Asy. Power MEM Volatility Analysis
Volatility prediction for Wednesday, July 22nd, 2026
1 Day
18.60%
decreased by 0.77%
1 Week
19.30%
decreased by 0.07%
1 Month
20.47%
increased by 1.10%
Analysis last updated: Tuesday, July 21, 2026 at 09:31 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 11, 2024 to Jul 17, 2026Model Insight
Volatility shocks decay with a half-life of 5 trading days, meaning a shock loses half its impact after approximately 5 days. The volatility power δ = 2.19 sits above 2, so large shocks influence volatility more than quadratically, dominating the response more than in standard GARCH.
μ
APMEM Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.2669 | 6.79*** |
α ARCH Response to squared shocks | 0.0481 | 0.00 |
β GARCH Volatility persistence | 0.7420 | 37.29*** |
γ leverage Additional response to negative shocks | 1.0000 | 0.00 |
δ power Transformation power | 2.1886 | 7.57*** |
Persistence:
0.860
Half-life:
5 days
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