V-Lab
Boston Scientific Corp GAS-GARCH Student T Volatility Analysis
Volatility prediction for Friday, September 18th, 2026
1 Day
46.56%
1 Week
46.52%
1 Month
46.37%
Analysis last updated: Thursday, September 17, 2026 at 09:40 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 0.995, volatility shocks have a half-life of 153 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 3.96 degrees of freedom, capturing fatter tails than a normal distribution.
GAS-GARCH-T Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 7.0647 | 1.16 |
| αARCH | 0.0476 | 15.47*** |
| βGARCH | 0.9955 | 273.71*** |
| νDF | 3.9613 | 6.57*** |
0.995
Persistence153d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 7.0647 | 1.16 |
α ARCH Response to squared shocks | 0.0476 | 15.47*** |
β GARCH Volatility persistence | 0.9955 | 273.71*** |
ν DF Student-t tail thickness | 3.9613 | 6.57*** |
Persistence:
0.995
Half-life:
153 days
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