V-Lab
BGI Group Joint Stock Co Spline-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
26.33%
decreased by 0.05%
1 Week
26.95%
increased by 0.57%
1 Month
28.65%
increased by 2.27%
Analysis last updated: Friday, September 11, 2026 at 09:35 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 4, 2011 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 13 trading days.
τ
Spline-GARCH Model
Tap to view equation
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0939 | 7.15*** |
| αARCH | 0.0970 | 7.15*** |
| βGARCH | 0.8494 | 35.77*** |
Spline Coefficients
K=3
| γ1 | -0.0224 | -0.97 |
| γ2 | 0.0679 | 1.89* |
| γ3 | -0.1397 | -4.53*** |
0.946
Persistence13d
Half-lifeτ
Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0939 | 7.15*** |
α ARCH Response to squared shocks | 0.0970 | 7.15*** |
β GARCH Volatility persistence | 0.8494 | 35.77*** |
Spline Coefficients
K=3
| γ1 | -0.0224 | -0.97 |
| γ2 | 0.0679 | 1.89* |
| γ3 | -0.1397 | -4.53*** |
Persistence:
0.946
Half-life:
13 days
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