V-Lab
TransMedics Group, Inc. Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Wednesday, September 9th, 2026
1 Day
61.10%
decreased by 2.58%
1 Week
65.27%
increased by 1.59%
1 Month
67.90%
increased by 4.22%
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
This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 1 trading day.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.7921 | 8.25*** |
| αARCH | 0.1870 | 2.65*** |
| βGARCH | 0.4268 | 4.23*** |
Spline Coefficients
K=2
| γ1 | -0.0674 | -1.58 |
| γ2 | 0.0811 | 1.46 |
0.614
Persistence1d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.7921 | 8.25*** |
α ARCH Response to squared shocks | 0.1870 | 2.65*** |
β GARCH Volatility persistence | 0.4268 | 4.23*** |
Spline Coefficients
K=2
| γ1 | -0.0674 | -1.58 |
| γ2 | 0.0811 | 1.46 |
Persistence:
0.614
Half-life:
1 days
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