V-Lab
Banco do Brasil SA GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
39.00%
increased by 0.56%
1 Week
39.24%
increased by 0.80%
1 Month
40.07%
increased by 1.63%
Analysis last updated: Friday, September 11, 2026 at 09:56 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 17, 1992 to Sep 4, 2026Model Insight
Volatility shocks decay with a half-life of 34 trading days, meaning a shock loses half its impact after approximately 34 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 34-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.1597 | 1.08 |
| αARCH | 0.0566 | 2.75*** |
| βGARCH | 0.9287 | 32.72*** |
| γleverage | -0.0109 | -0.19 |
0.980
Persistence34d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1597 | 1.08 |
α ARCH Response to squared shocks | 0.0566 | 2.75*** |
β GARCH Volatility persistence | 0.9287 | 32.72*** |
γ leverage Additional response to negative shocks | -0.0109 | -0.19 |
Persistence:
0.980
Half-life:
34 days
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