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TransMedics Group, Inc. GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, September 9th, 2026

1 Day

64.89%

decreased by 3.77%

1 Week

65.87%

decreased by 2.79%

1 Month

67.40%

decreased by 1.26%

Analysis last updated: Tuesday, September 8, 2026 at 10:39 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

All

graph of TransMedics Group, Inc. GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 2, 2019 to Sep 4, 2026

Model Insight

Volatility shocks decay with a half-life of 4 trading days, meaning a shock loses half its impact after approximately 4 days. Returns follow a Student-t distribution with v = 3.97 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

Shock decay: Shocks decay with a 4-day half-lifev = 3.97 · fat tails
ParamValuet-stat
ωconst18.5637
1.62
αARCH0.1095
1.59
βGARCH0.8393
9.45***
νDF3.9698
0.72

0.839

Persistence

4d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

18.5637
1.62
α

ARCH

Response to squared shocks

0.1095
1.59
β

GARCH

Volatility persistence

0.8393
9.45***
ν

DF

Student-t tail thickness

3.9698
0.72

Persistence:

0.839

Half-life:

4 days