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V-Lab

SEI Select Small CAP ETF GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, July 22nd, 2026

1 Day

19.77%

increased by 0.46%

1 Week

19.96%

increased by 0.65%

1 Month

20.47%

increased by 1.16%

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 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 Jul 17, 2026

Model Insight

Volatility shocks decay with a half-life of 10 trading days, meaning a shock loses half its impact after approximately 10 days. Returns follow a Student-t distribution with v = 5.14 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

1.7946
2.86***
α

ARCH

Response to squared shocks

0.0351
2.02**
β

GARCH

Volatility persistence

0.9317
61.98***
ν

DF

Student-t tail thickness

5.1441
0.43

Persistence:

0.932

Half-life:

10 days