V-Lab
Alphabet Inc EGARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
28.78%
decreased by 1.01%
1 Week
29.15%
decreased by 0.64%
1 Month
30.40%
increased by 0.61%
Analysis last updated: Thursday, September 10, 2026 at 09:35 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Aug 19, 2004 to Sep 4, 2026Model Insight
Volatility shocks decay with a half-life of 23 trading days, meaning a shock loses half its impact after approximately 23 days.
σ
EGARCH Model
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Shock decay: Shocks decay with a 23-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0483 | 2.92*** |
| αARCH | 0.1466 | 5.19*** |
| βGARCH | 0.9702 | 90.46*** |
| γleverage | -0.0272 | -1.41 |
0.970
Persistence23d
Half-lifeσ
EGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0483 | 2.92*** |
α ARCH Response to squared shocks | 0.1466 | 5.19*** |
β GARCH Volatility persistence | 0.9702 | 90.46*** |
γ leverage Additional response to negative shocks | -0.0272 | -1.41 |
Persistence:
0.970
Half-life:
23 days
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