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V-Lab

Samhallsbygg I Nor Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

50.50%

decreased by 1.23%

1 Week

57.42%

increased by 5.69%

1 Month

59.34%

increased by 7.61%

Analysis last updated: Saturday, September 19, 2026 at 08:31 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

All

graph of Samhallsbygg I Nor S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Feb 3, 2023 to Sep 18, 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 1 trading day.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst0.4849
3.13***
αARCH0.2942
3.42***
βGARCH0.0000
0.00
γi Spline Coefficients
K=6
γ1-10.6157
-2.67***
γ214.1526
2.49**
γ3-3.2844
-1.09
γ4-3.2517
-1.39
γ55.7413
1.90*
γ6-3.2447
-1.10

0.294

Persistence

1d

Half-life
τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.4849
3.13***
α

ARCH

Response to squared shocks

0.2942
3.42***
β

GARCH

Volatility persistence

0.0000
0.00
γi Spline Coefficients
K=6
γ1-10.6157
-2.67***
γ214.1526
2.49**
γ3-3.2844
-1.09
γ4-3.2517
-1.39
γ55.7413
1.90*
γ6-3.2447
-1.10

Persistence:

0.294

Half-life:

1 days