CAC 40 Index GARCH Volatility Analysis
Volatility prediction for Monday, October 26th, 2026
1 Day
14.78%
decreased by 0.53%
1 Week
15.08%
decreased by 0.23%
1 Month
16.07%
increased by 0.76%
Analysis last updated: Friday, October 23, 2026 at 04:05 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Oct 23, 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
GARCH Model
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Shock decay: Shocks decay with a 34-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0354 | 5.17*** |
| αARCH | 0.1002 | 9.33*** |
| βGARCH | 0.8796 | 72.56*** |
0.980
Persistence34d
Half-lifeσ
GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0354 | 5.17*** |
α ARCH Response to squared shocks | 0.1002 | 9.33*** |
β GARCH Volatility persistence | 0.8796 | 72.56*** |
Persistence:
0.980
Half-life:
34 days
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