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

Volatility prediction for Friday, October 9th, 2026

1 Day

76.31%

decreased by 3.23%

1 Week

77.37%

decreased by 2.17%

1 Month

79.68%

increased by 0.14%

Analysis last updated: Saturday, October 10, 2026 at 02:30 AM UTC

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Date Range:

from

10/08/2024

to

10/08/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

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

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Mar 16, 2011 to Oct 8, 2026

Model Insight

Volatility shocks decay with a half-life of 7 trading days, meaning a shock loses half its impact after approximately 7 days. Returns follow a Student-t distribution with v = 4.03 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

Shock decay: Shocks decay with a 7-day half-lifev = 4.03 · fat tails
ParamValuet-stat
ωconst26.7917
2.36**
αARCH0.1018
3.98***
βGARCH0.9033
20.29***
νDF4.0297
1.51

0.903

Persistence

7d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

26.7917
2.36**
α

ARCH

Response to squared shocks

0.1018
3.98***
β

GARCH

Volatility persistence

0.9033
20.29***
ν

DF

Student-t tail thickness

4.0297
1.51

Persistence:

0.903

Half-life:

7 days