Boston Scientific Corp GAS-GARCH Student T Volatility Analysis
Volatility prediction for Wednesday, October 21st, 2026
1 Day
33.00%
1 Week
33.09%
1 Month
33.45%
Analysis last updated: Tuesday, October 20, 2026 at 10:21 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 20, 1992 to Oct 16, 2026Model Insight
With persistence 0.995, volatility shocks have a half-life of 145 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 |
|---|---|---|
| ωlong-run | 6.8737 | 1.13 |
| αscore | 0.0478 | 14.95*** |
| βpersistence | 0.9952 | 251.71*** |
| νDF | 3.9622 | 6.21*** |
0.995
Persistence145d
Half-lifeGAS-GARCH-T Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω long-run Long-run variance given a price move | 6.8737 | 1.13 |
α score Weight on the scaled score | 0.0478 | 14.95*** |
β persistence Volatility persistence | 0.9952 | 251.71*** |
ν DF Student-t tail thickness | 3.9622 | 6.21*** |
Persistence:
0.995
Half-life:
145 days
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