V-Lab
Alphabet Inc Asy. MEM Volatility Analysis
Volatility prediction for Tuesday, September 29th, 2026
1 Day
28.88%
decreased by 2.67%
1 Week
29.09%
decreased by 2.46%
1 Month
29.82%
decreased by 1.73%
Analysis last updated: Monday, September 28, 2026 at 09:24 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Aug 19, 2004 to Sep 25, 2026Model Insight
Volatility shocks decay with a half-life of 33 trading days, meaning a shock loses half its impact after approximately 33 days.
μ
AMEM Model
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Shock decay: Shocks decay with a 33-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0943 | 6.33*** |
| αARCH | 0.1855 | 9.22*** |
| βGARCH | 0.7654 | 54.36*** |
| γleverage | 0.0562 | 1.73* |
0.979
Persistence33d
Half-lifeμ
AMEM Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0943 | 6.33*** |
α ARCH Response to squared shocks | 0.1855 | 9.22*** |
β GARCH Volatility persistence | 0.7654 | 54.36*** |
γ leverage Additional response to negative shocks | 0.0562 | 1.73* |
Persistence:
0.979
Half-life:
33 days
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