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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

Date Range:

from

to

6M ·

1Y ·

All

graph of SEI Select Small CAP ETF GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 10, 2024 to Aug 7, 2026

Model 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

ParameterValuet-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