V-Lab
CBOE Brazil ETF Volatility Index GARCH Volatility Analysis
Volatility prediction for Friday, September 18th, 2026
1 Day
69.21%
decreased by 3.53%
1 Week
73.63%
increased by 0.89%
1 Month
79.55%
increased by 6.81%
Analysis last updated: Friday, September 18, 2026 at 09:59 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Mar 16, 2011 to Sep 10, 2026Model Insight
Volatility shocks decay with a half-life of 3 trading days, meaning a shock loses half its impact after approximately 3 days.
σ
GARCH Model
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Shock decay: Shocks decay with a 3-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 5.0000 | 4.86*** |
| αARCH | 0.1494 | 4.27*** |
| βGARCH | 0.6669 | 13.07*** |
0.816
Persistence3d
Half-lifeσ
GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 5.0000 | 4.86*** |
α ARCH Response to squared shocks | 0.1494 | 4.27*** |
β GARCH Volatility persistence | 0.6669 | 13.07*** |
Persistence:
0.816
Half-life:
3 days
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