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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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Tadawul All Share TASI Index AGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 19, 1998 to Sep 10, 2026

Model 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

Tap to view equation

Asymmetry: negative returns raise volatility more
ParamValuet-stat
ωconst0.0353
5.31***
αARCH0.1899
11.18***
βGARCH0.7993
56.79***
γleverage0.2680
4.62***

0.989

Persistence

64d

Half-life
σ

AGARCH Model

Tap to view equation

ParameterValuet-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