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
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Aug 19, 2004 to Sep 11, 2026Model 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
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Shock decay: Shocks decay with a 27-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0982 | 2.45** |
| αARCH | 0.0333 | 3.23*** |
| βGARCH | 0.9212 | 49.57*** |
| γleverage | 0.0403 | 1.63 |
0.975
Persistence27d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-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
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