V-Lab
Cellnex Telecom SAU Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
26.60%
decreased by 0.26%
1 Week
27.05%
increased by 0.19%
1 Month
28.01%
increased by 1.15%
Analysis last updated: Friday, September 11, 2026 at 09:18 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 7, 2015 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 7 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 | 0.8732 | 11.65*** |
| αARCH | 0.1121 | 5.20*** |
| βGARCH | 0.7896 | 21.38*** |
Spline Coefficients
K=1
| γ1 | -0.0022 | -1.61 |
0.902
Persistence7d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.8732 | 11.65*** |
α ARCH Response to squared shocks | 0.1121 | 5.20*** |
β GARCH Volatility persistence | 0.7896 | 21.38*** |
Spline Coefficients
K=1
| γ1 | -0.0022 | -1.61 |
Persistence:
0.902
Half-life:
7 days
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