V-Lab
Spenda Ltd Spline-GARCH Volatility Analysis
Volatility prediction for Friday, September 4th, 2026
1 Day
413.31%
decreased by 2.71%
1 Week
416.76%
increased by 0.74%
1 Month
427.38%
increased by 11.36%
Analysis last updated: Friday, September 4, 2026 at 05:54 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 29, 2002 to Aug 28, 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 18 trading days.
τ
Spline-GARCH Model
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Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0873 | 4.76*** |
| αARCH | 0.0765 | 6.88*** |
| βGARCH | 0.8857 | 37.09*** |
Spline Coefficients
K=10
| γ1 | 0.2109 | 0.82 |
| γ2 | 0.4246 | 0.98 |
| γ3 | -1.1450 | -3.17*** |
| γ4 | 1.0860 | 3.74*** |
| γ5 | -1.6237 | -4.68*** |
| γ6 | 1.8669 | 4.14*** |
| γ7 | -1.3624 | -2.47** |
| γ8 | 1.0727 | 2.18** |
| γ9 | -0.8114 | -2.32** |
| γ10 | 0.9270 | 2.58*** |
0.962
Persistence18d
Half-lifeτ
Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0873 | 4.76*** |
α ARCH Response to squared shocks | 0.0765 | 6.88*** |
β GARCH Volatility persistence | 0.8857 | 37.09*** |
Spline Coefficients
K=10
| γ1 | 0.2109 | 0.82 |
| γ2 | 0.4246 | 0.98 |
| γ3 | -1.1450 | -3.17*** |
| γ4 | 1.0860 | 3.74*** |
| γ5 | -1.6237 | -4.68*** |
| γ6 | 1.8669 | 4.14*** |
| γ7 | -1.3624 | -2.47** |
| γ8 | 1.0727 | 2.18** |
| γ9 | -0.8114 | -2.32** |
| γ10 | 0.9270 | 2.58*** |
Persistence:
0.962
Half-life:
18 days
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