V-Lab
TransMedics Group, Inc. GJR-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 8th, 2026
1 Day
62.34%
decreased by 0.71%
1 Week
66.85%
increased by 3.80%
1 Month
71.76%
increased by 8.71%
Analysis last updated: Friday, September 4, 2026 at 10:22 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 2, 2019 to Sep 4, 2026Boundary Parameters
Model Insight
Volatility shocks decay with a half-life of 3 trading days, meaning a shock loses half its impact after approximately 3 days.
σ
GJR-GARCH Model
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Shock decay: Shocks decay with a 3-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 5.0000 | 2.61*** |
| αARCH | 0.1005 | 1.71* |
| βGARCH | 0.5874 | 4.71*** |
| γleverage | 0.1642 | 0.99 |
0.770
Persistence3d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 5.0000 | 2.61*** |
α ARCH Response to squared shocks | 0.1005 | 1.71* |
β GARCH Volatility persistence | 0.5874 | 4.71*** |
γ leverage Additional response to negative shocks | 0.1642 | 0.99 |
Persistence:
0.770
Half-life:
3 days
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