V-Lab
Banco do Brasil SA GAS-GARCH Student T Volatility Analysis
Volatility prediction for Wednesday, August 5th, 2026
1 Day
23.58%
increased by 0.16%
1 Week
23.55%
increased by 0.13%
1 Month
23.43%
increased by 0.01%
Analysis last updated: Wednesday, August 5, 2026 at 08:40 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 17, 1992 to Jul 31, 2026Model Insight
With persistence 0.999, volatility shocks have a half-life of 548 trading days (~2.2 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 7.77 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 | 4.00*** |
α ARCH Response to squared shocks | 0.1392 | 27.15*** |
β GARCH Volatility persistence | 0.9987 | |
ν DF Student-t tail thickness | 7.7715 | 15.86*** |
Persistence:
0.999
Half-life:
548 days
Other Banco do Brasil SA Analyses
Other GAS-GARCH Student T Analyses on International Equities