V-Lab
Sonda S.A. Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 15th, 2026
1 Day
24.94%
decreased by 1.11%
1 Week
24.53%
decreased by 1.52%
1 Month
23.46%
decreased by 2.59%
Analysis last updated: Wednesday, September 16, 2026 at 03:19 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 9, 2006 to Sep 14, 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 9 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 | 1.0970 | 8.03*** |
| αARCH | 0.0969 | 6.26*** |
| βGARCH | 0.8269 | 30.48*** |
Spline Coefficients
K=6
| γ1 | 0.0197 | 0.40 |
| γ2 | 0.0318 | 0.37 |
| γ3 | -0.1192 | -1.38 |
| γ4 | 0.1603 | 1.97** |
| γ5 | -0.2068 | -3.33*** |
| γ6 | 0.1675 | 4.16*** |
0.924
Persistence9d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0970 | 8.03*** |
α ARCH Response to squared shocks | 0.0969 | 6.26*** |
β GARCH Volatility persistence | 0.8269 | 30.48*** |
Spline Coefficients
K=6
| γ1 | 0.0197 | 0.40 |
| γ2 | 0.0318 | 0.37 |
| γ3 | -0.1192 | -1.38 |
| γ4 | 0.1603 | 1.97** |
| γ5 | -0.2068 | -3.33*** |
| γ6 | 0.1675 | 4.16*** |
Persistence:
0.924
Half-life:
9 days
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