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Tadawul All Share TASI Index APARCH Volatility Analysis

Volatility prediction for Saturday, September 26th, 2026

1 Day

12.59%

decreased by 1.23%

1 Week

13.30%

decreased by 0.52%

1 Month

15.65%

increased by 1.83%

Analysis last updated: Wednesday, September 23, 2026 at 05:43 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Tadawul All Share TASI Index APARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 19, 1998 to Sep 22, 2026

Model Insight

This asset exhibits a strong leverage effect: negative returns increase next-day volatility 115% more than equivalent positive returns. The volatility power δ = 1.33 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.

σ

APARCH Model

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Leverage: Negative returns increase volatility 115% more than positive returnsδ = 1.33 · sub-quadratic power
ParamValuet-stat
ωconst0.0486
6.97***
αARCH0.1762
11.04***
βGARCH0.8238
56.26***
γleverage0.2796
5.16***
δpower1.3335
9.14***

0.973

Persistence

25d

Half-life
σ

APARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0486
6.97***
α

ARCH

Response to squared shocks

0.1762
11.04***
β

GARCH

Volatility persistence

0.8238
56.26***
γ

leverage

Additional response to negative shocks

0.2796
5.16***
δ

power

Transformation power

1.3335
9.14***

Persistence:

0.973

Half-life:

25 days