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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

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graph of Alphabet Inc AMEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Aug 19, 2004 to Sep 25, 2026

Model 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

Tap to view equation

Shock decay: Shocks decay with a 33-day half-life
ParamValuet-stat
ωconst0.0943
6.33***
αARCH0.1855
9.22***
βGARCH0.7654
54.36***
γleverage0.0562
1.73*

0.979

Persistence

33d

Half-life
μ

AMEM Model

Tap to view equation

ParameterValuet-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