V-Lab
Capgemini Se GJR-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
36.67%
increased by 0.55%
1 Week
36.54%
increased by 0.42%
1 Month
36.09%
decreased by 0.03%
Analysis last updated: Saturday, September 19, 2026 at 08:37 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 16, 2004 to Sep 18, 2026Model Insight
Volatility shocks decay with a half-life of 52 trading days, meaning a shock loses half its impact after approximately 52 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 52-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0530 | 3.12*** |
| αARCH | 0.0000 | 0.00 |
| βGARCH | 0.9578 | 145.23*** |
| γleverage | 0.0577 | 4.57*** |
0.987
Persistence52d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0530 | 3.12*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.9578 | 145.23*** |
γ leverage Additional response to negative shocks | 0.0577 | 4.57*** |
Persistence:
0.987
Half-life:
52 days
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