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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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Cellnex Telecom SAU S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 7, 2015 to Sep 4, 2026

Model 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
ParamValuet-stat
ωconst0.8732
11.65***
αARCH0.1121
5.20***
βGARCH0.7896
21.38***
γi Spline Coefficients
K=1
γ1-0.0022
-1.61

0.902

Persistence

7d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-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***
γi Spline Coefficients
K=1
γ1-0.0022
-1.61

Persistence:

0.902

Half-life:

7 days