V-Lab
Tadawul All Share TASI Index AGARCH Volatility Analysis
Volatility prediction for Saturday, September 12th, 2026
1 Day
10.88%
decreased by 0.45%
1 Week
11.84%
increased by 0.51%
1 Month
14.89%
increased by 3.56%
Analysis last updated: Friday, September 11, 2026 at 05:41 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 19, 1998 to Sep 10, 2026Model Insight
The news-impact curve is shifted (γ = 0.27) so that negative returns raise next-day volatility more than positive returns of the same size. The gap is largest for small shocks and narrows for larger ones.
σ
AGARCH Model
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Asymmetry: negative returns raise volatility more
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0353 | 5.31*** |
| αARCH | 0.1899 | 11.18*** |
| βGARCH | 0.7993 | 56.79*** |
| γleverage | 0.2680 | 4.62*** |
0.989
Persistence64d
Half-lifeσ
AGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0353 | 5.31*** |
α ARCH Response to squared shocks | 0.1899 | 11.18*** |
β GARCH Volatility persistence | 0.7993 | 56.79*** |
γ leverage Additional response to negative shocks | 0.2680 | 4.62*** |
Persistence:
0.989
Half-life:
64 days
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