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Boston Scientific Corp GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, October 21st, 2026

1 Day

33.00%

decreased by 0.42%

1 Week

33.09%

decreased by 0.33%

1 Month

33.45%

increased by 0.03%

Analysis last updated: Tuesday, October 20, 2026 at 10:21 PM UTC

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Date Range:

from

10/20/2024

to

10/20/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Boston Scientific Corp GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 20, 1992 to Oct 16, 2026

Model 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.

𝑓

GAS-GARCH-T Model

Tap to view equation

High persistence: persistence 0.995, shock half-life ~145 daysv = 3.96 · fat tails
ParamValuet-stat
ωlong-run6.8737
1.13
αscore0.0478
14.95***
βpersistence0.9952
251.71***
νDF3.9622
6.21***

0.995

Persistence

145d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-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