V-Lab
TransMedics Group, Inc. Asy. Power MEM Volatility Analysis
Volatility prediction for Tuesday, September 8th, 2026
1 Day
68.03%
1 Week
62.54%
1 Month
57.44%
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, 2026Model Insight
Volatility shocks decay with a half-life of 2 trading days, meaning a shock loses half its impact after approximately 2 days. The volatility power δ = 0.99 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
APMEM Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0000 | 1.12 |
| αARCH | 0.3681 | 12.23*** |
| βGARCH | 0.4141 | 8.02*** |
| γleverage | 0.0295 | 0.99 |
| δpower | 0.9857 | 1.52 |
0.708
Persistence2d
Half-lifeAPMEM Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0000 | 1.12 |
α ARCH Response to squared shocks | 0.3681 | 12.23*** |
β GARCH Volatility persistence | 0.4141 | 8.02*** |
γ leverage Additional response to negative shocks | 0.0295 | 0.99 |
δ power Transformation power | 0.9857 | 1.52 |
Persistence:
0.708
Half-life:
2 days
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