V-Lab
Boston Scientific Corp AGARCH Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
44.73%
decreased by 1.07%
1 Week
44.67%
decreased by 1.13%
1 Month
44.44%
decreased by 1.36%
Analysis last updated: Friday, September 11, 2026 at 11:49 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 20, 1992 to Sep 11, 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.
Asymmetry: negative returns raise volatility more
σ
AGARCH Model
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High persistence: persistence 0.990, shock half-life ~70 daysAsymmetry: negative returns raise volatility more
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0000 | 0.00 |
| αARCH | 0.0454 | 9.94*** |
| βGARCH | 0.9447 | 200.91*** |
| γleverage | 1.2160 | 3.61*** |
0.990
Persistence70d
Half-lifeσ
AGARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0000 | 0.00 |
α ARCH Response to squared shocks | 0.0454 | 9.94*** |
β GARCH Volatility persistence | 0.9447 | 200.91*** |
γ leverage Additional response to negative shocks | 1.2160 | 3.61*** |
Persistence:
0.990
Half-life:
70 days
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