Johnson & Johnson GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, October 12th, 2026
1 Day
21.35%
increased by 1.88%
1 Week
21.39%
increased by 1.92%
1 Month
21.54%
increased by 2.07%
Analysis last updated: Saturday, October 10, 2026 at 01:53 AM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Oct 9, 2026Model Insight
With persistence 0.992, volatility shocks have a half-life of 84 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 5.87 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
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High persistence: persistence 0.992, shock half-life ~84 daysv = 5.87 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 2.2205 | 1.07 |
| αARCH | 0.0794 | 9.58*** |
| βGARCH | 0.9917 | 122.85*** |
| νDF | 5.8665 | 2.35** |
0.992
Persistence84d
Half-life𝑓
GAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.2205 | 1.07 |
α ARCH Response to squared shocks | 0.0794 | 9.58*** |
β GARCH Volatility persistence | 0.9917 | 122.85*** |
ν DF Student-t tail thickness | 5.8665 | 2.35** |
Persistence:
0.992
Half-life:
84 days
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