V-Lab
PMA Graphene Technology Group Inc Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 15th, 2026
1 Day
118.33%
decreased by 2.96%
1 Week
134.47%
increased by 13.18%
1 Month
145.01%
increased by 23.72%
Analysis last updated: Monday, September 14, 2026 at 09:34 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 22, 2024 to Sep 11, 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 2 trading days.
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 | 1.3049 | 4.06*** |
| αARCH | 0.3706 | 2.71*** |
| βGARCH | 0.2697 | 1.95* |
Spline Coefficients
K=1
| γ1 | 0.1361 | 0.99 |
0.640
Persistence2d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.3049 | 4.06*** |
α ARCH Response to squared shocks | 0.3706 | 2.71*** |
β GARCH Volatility persistence | 0.2697 | 1.95* |
Spline Coefficients
K=1
| γ1 | 0.1361 | 0.99 |
Persistence:
0.640
Half-life:
2 days
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