V-Lab
Softbank Group Corp Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
72.51%
decreased by 5.21%
1 Week
70.33%
decreased by 7.39%
1 Month
63.95%
decreased by 13.77%
Analysis last updated: Friday, September 11, 2026 at 06:57 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Feb 16, 2000 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 11 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 | 2.3935 | 9.08*** |
| αARCH | 0.1196 | 8.72*** |
| βGARCH | 0.8203 | 43.84*** |
Spline Coefficients
K=3
| γ1 | 0.0108 | 2.26** |
| γ2 | -0.0002 | -0.03 |
| γ3 | -0.0153 | -3.36*** |
0.940
Persistence11d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.3935 | 9.08*** |
α ARCH Response to squared shocks | 0.1196 | 8.72*** |
β GARCH Volatility persistence | 0.8203 | 43.84*** |
Spline Coefficients
K=3
| γ1 | 0.0108 | 2.26** |
| γ2 | -0.0002 | -0.03 |
| γ3 | -0.0153 | -3.36*** |
Persistence:
0.940
Half-life:
11 days
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