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Boston Scientific Corp GAS-GARCH Student T Volatility Analysis

Volatility prediction for Friday, September 25th, 2026

1 Day

40.93%

decreased by 1.82%

1 Week

40.94%

decreased by 1.81%

1 Month

40.99%

decreased by 1.76%

Analysis last updated: Thursday, September 24, 2026 at 09:34 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 18, 2026

Model Insight

With persistence 0.995, volatility shocks have a half-life of 152 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 ~152 daysv = 3.96 · fat tails
ParamValuet-stat
ωconst7.0470
1.15
αARCH0.0476
15.42***
βGARCH0.9955
272.35***
νDF3.9614
6.54***

0.995

Persistence

152d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

7.0470
1.15
α

ARCH

Response to squared shocks

0.0476
15.42***
β

GARCH

Volatility persistence

0.9955
272.35***
ν

DF

Student-t tail thickness

3.9614
6.54***

Persistence:

0.995

Half-life:

152 days