V-Lab
Johnson & Johnson GJR-GARCH Volatility Analysis
Volatility prediction for Monday, August 10th, 2026
1 Day
23.73%
decreased by 0.81%
1 Week
23.76%
decreased by 0.78%
1 Month
23.86%
decreased by 0.68%
Analysis last updated: Friday, August 7, 2026 at 10:45 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Aug 7, 2026Model Insight
With persistence 0.990, volatility shocks have a half-life of 70 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 175% more than positive returns
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0248 | 19.79*** |
α ARCH Response to squared shocks | 0.0424 | 18.85*** |
β GARCH Volatility persistence | 0.9107 | 474.06*** |
γ leverage Additional response to negative shocks | 0.0741 | 12.95*** |
Persistence:
0.990
Half-life:
70 days
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