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V-Lab
V-Lab

Alphabet Inc GJR-GARCH Volatility Analysis

Volatility prediction for Monday, September 14th, 2026

1 Day

28.59%

decreased by 0.26%

1 Week

28.72%

decreased by 0.13%

1 Month

29.19%

increased by 0.34%

Analysis last updated: Friday, September 11, 2026 at 10:52 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Alphabet Inc GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Aug 19, 2004 to Sep 11, 2026

Model Insight

Volatility shocks decay with a half-life of 27 trading days, meaning a shock loses half its impact after approximately 27 days.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 27-day half-life
ParamValuet-stat
ωconst0.0982
2.45**
αARCH0.0333
3.23***
βGARCH0.9212
49.57***
γleverage0.0403
1.63

0.975

Persistence

27d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0982
2.45**
α

ARCH

Response to squared shocks

0.0333
3.23***
β

GARCH

Volatility persistence

0.9212
49.57***
γ

leverage

Additional response to negative shocks

0.0403
1.63

Persistence:

0.975

Half-life:

27 days