V-Lab
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
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 2, 2019 to Sep 4, 2026Model 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
| Param | Value | t-stat |
|---|---|---|
| ωconst | 18.5637 | 1.62 |
| αARCH | 0.1095 | 1.59 |
| βGARCH | 0.8393 | 9.45*** |
| νDF | 3.9698 | 0.72 |
0.839
Persistence4d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-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
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