V-Lab
Egyptian EGX 30 Price Return Index Spline-GARCH Volatility Analysis
Volatility prediction for Sunday, September 13th, 2026
1 Day
16.28%
decreased by 0.32%
1 Week
17.34%
increased by 0.74%
1 Month
20.29%
increased by 3.69%
Analysis last updated: Saturday, September 12, 2026 at 12:50 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1998 to Sep 10, 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 | 1.0151 | 4.87*** |
| αARCH | 0.1210 | 6.38*** |
| βGARCH | 0.8404 | 30.16*** |
Spline Coefficients
K=3
| γ1 | 0.0043 | 0.61 |
| γ2 | -0.0144 | -1.22 |
| γ3 | 0.0255 | 2.06** |
0.961
Persistence18d
Half-lifeτ
Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0151 | 4.87*** |
α ARCH Response to squared shocks | 0.1210 | 6.38*** |
β GARCH Volatility persistence | 0.8404 | 30.16*** |
Spline Coefficients
K=3
| γ1 | 0.0043 | 0.61 |
| γ2 | -0.0144 | -1.22 |
| γ3 | 0.0255 | 2.06** |
Persistence:
0.961
Half-life:
18 days
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