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V-Lab

SEI Select Small CAP ETF APARCH Volatility Analysis

Volatility prediction for Wednesday, July 22nd, 2026

1 Day

19.52%

decreased by 0.84%

1 Week

19.92%

decreased by 0.44%

1 Month

21.13%

increased by 0.77%

Analysis last updated: Tuesday, July 21, 2026 at 09:31 PM UTC

Date Range:

from

to

6M ·

1Y ·

All

graph of SEI Select Small CAP ETF APARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 10, 2024 to Jul 17, 2026

Model Insight

Volatility shocks decay with a half-life of 14 trading days, meaning a shock loses half its impact after approximately 14 days. The volatility power δ = 0.97 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.

σ

APARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0738
3.08***
α

ARCH

Response to squared shocks

0.0620
8.30***
β

GARCH

Volatility persistence

0.9019
41.45***
γ

leverage

Additional response to negative shocks

1.0000
11.06***
δ

power

Transformation power

0.9717
4.75***

Persistence:

0.950

Half-life:

14 days