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CBOE EFA ETF Volatility Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Friday, July 24th, 2026

1 Day

154.79%

increased by 25.16%

1 Week

155.09%

increased by 25.46%

1 Month

155.92%

increased by 26.29%

Analysis last updated: Friday, July 24, 2026 at 11:37 AM UTC

Date Range:

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to

6M ·

1Y ·

2Y ·

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10Y ·

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graph of CBOE EFA ETF Volatility Index GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 2008 to Jul 17, 2026

Model Insight

Volatility shocks decay with a half-life of 12 trading days, meaning a shock loses half its impact after approximately 12 days. Returns follow a Student-t distribution with v = 3.80 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

98.4617
8.58***
α

ARCH

Response to squared shocks

0.1268
27.53***
β

GARCH

Volatility persistence

0.9427
153.10***
ν

DF

Student-t tail thickness

3.8033
12.95***

Persistence:

0.943

Half-life:

12 days