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Boston Scientific Corp GAS-GARCH Student T Volatility Analysis

Volatility prediction for Friday, September 18th, 2026

1 Day

46.56%

decreased by 1.71%

1 Week

46.52%

decreased by 1.75%

1 Month

46.37%

decreased by 1.90%

Analysis last updated: Thursday, September 17, 2026 at 09:40 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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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 Sep 11, 2026

Model 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.

𝑓

GAS-GARCH-T Model

Tap to view equation

High persistence: persistence 0.995, shock half-life ~153 daysv = 3.96 · fat tails
ParamValuet-stat
ωconst7.0647
1.16
αARCH0.0476
15.47***
βGARCH0.9955
273.71***
νDF3.9613
6.57***

0.995

Persistence

153d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-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