V-Lab
Coca-Cola Co/The GJR-GARCH Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
17.30%
decreased by 0.38%
1 Week
17.42%
decreased by 0.26%
1 Month
17.88%
increased by 0.20%
Analysis last updated: Saturday, September 12, 2026 at 12:14 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 11, 2026Model Insight
With persistence 0.994, volatility shocks have a half-life of 120 trading days (~0.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 214% more than positive returns
σ
GJR-GARCH Model
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High persistence: persistence 0.994, shock half-life ~120 daysLeverage: Negative returns increase volatility 214% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0152 | 4.20*** |
| αARCH | 0.0265 | 3.83*** |
| βGARCH | 0.9395 | 125.57*** |
| γleverage | 0.0565 | 3.69*** |
0.994
Persistence120d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0152 | 4.20*** |
α ARCH Response to squared shocks | 0.0265 | 3.83*** |
β GARCH Volatility persistence | 0.9395 | 125.57*** |
γ leverage Additional response to negative shocks | 0.0565 | 3.69*** |
Persistence:
0.994
Half-life:
120 days
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