V-Lab
Catalyst Media Group PLC Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, September 7th, 2026
1 Day
77.64%
decreased by 0.17%
1 Week
85.34%
increased by 7.53%
1 Month
91.20%
increased by 13.39%
Analysis last updated: Sunday, September 6, 2026 at 02:11 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 2007 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 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 | 2.2662 | 3.13*** |
| αARCH | 0.1458 | 3.06*** |
| βGARCH | 0.5328 | 4.39*** |
Spline Coefficients
K=10
| γ1 | 0.7894 | 0.31 |
| γ2 | -0.8294 | -0.21 |
| γ3 | -0.8702 | -0.31 |
| γ4 | 3.5257 | 1.16 |
| γ5 | -4.5859 | -1.41 |
| γ6 | 2.3308 | 0.73 |
| γ7 | 0.5959 | 0.22 |
| γ8 | -3.8832 | -1.80* |
| γ9 | 7.5999 | 4.28*** |
| γ10 | -7.1575 | -6.22*** |
0.679
Persistence2d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.2662 | 3.13*** |
α ARCH Response to squared shocks | 0.1458 | 3.06*** |
β GARCH Volatility persistence | 0.5328 | 4.39*** |
Spline Coefficients
K=10
| γ1 | 0.7894 | 0.31 |
| γ2 | -0.8294 | -0.21 |
| γ3 | -0.8702 | -0.31 |
| γ4 | 3.5257 | 1.16 |
| γ5 | -4.5859 | -1.41 |
| γ6 | 2.3308 | 0.73 |
| γ7 | 0.5959 | 0.22 |
| γ8 | -3.8832 | -1.80* |
| γ9 | 7.5999 | 4.28*** |
| γ10 | -7.1575 | -6.22*** |
Persistence:
0.679
Half-life:
2 days
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