V-Lab
Banco do Brasil SA GAS-GARCH Student T Volatility Analysis
Volatility prediction for Tuesday, August 25th, 2026
1 Day
29.14%
decreased by 2.23%
1 Week
29.09%
decreased by 2.28%
1 Month
28.93%
decreased by 2.44%
Analysis last updated: Tuesday, August 25, 2026 at 08:47 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 17, 1992 to Aug 21, 2026Model Insight
With persistence 0.999, volatility shocks have a half-life of 480 trading days (~1.9 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 7.76 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0000 | |
α ARCH Response to squared shocks | 0.1435 | 26.95*** |
β GARCH Volatility persistence | 0.9986 | 9,694.72*** |
ν DF Student-t tail thickness | 7.7551 | 16.11*** |
Persistence:
0.999
Half-life:
480 days
Other Banco do Brasil SA Analyses
Other GAS-GARCH Student T Analyses on International Equities