Skip to main content
V-Lab

Ibovespa Brasil Sao Paulo Stock Exchange Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Friday, July 24th, 2026

1 Day

13,517.66%

decreased by 605.13%

1 Week

13,504.15%

decreased by 618.64%

1 Month

13,450.33%

decreased by 672.46%

Analysis last updated: Thursday, July 23, 2026 at 09:02 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Ibovespa Brasil Sao Paulo Stock Exchange Index GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Jul 21, 2026

Model Insight

The estimated Student-t degrees of freedom v = 2.00 sit at the infinite-variance boundary (v → 2): the model is attributing extreme moves to heavy tails rather than to volatility, so the volatility scale is unreliable here. See the boundary-parameters flag.

𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

8.0684
0.56
α

ARCH

Response to squared shocks

0.0933
2.78***
β

GARCH

Volatility persistence

0.9990
720.26***
ν

DF

Student-t tail thickness

2.0000
2,713.71***

Persistence:

0.999

Half-life:

693 days