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V-Lab
V-Lab

Hong Kong Hang Seng Index Asy. Power MEM Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

14.75%

decreased by 0.94%

1 Week

14.37%

decreased by 1.32%

1 Month

13.15%

decreased by 2.54%

Analysis last updated: Friday, September 18, 2026 at 09:08 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Hong Kong Hang Seng Index APMEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Sep 18, 2026

Model Insight

This asset exhibits a modest leverage effect: negative returns increase next-day volatility 25% more than equivalent positive returns. The volatility power δ = 0.88 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.

μ

APMEM Model

Tap to view equation

Leverage: Negative returns increase volatility 25% more than positive returnsδ = 0.88 · sub-quadratic power
ParamValuet-stat
ωconst0.0192
7.20***
αARCH0.1448
13.51***
βGARCH0.8525
81.33***
γleverage0.1247
4.52***
δpower0.8829
7.37***

0.967

Persistence

21d

Half-life
μ

APMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0192
7.20***
α

ARCH

Response to squared shocks

0.1448
13.51***
β

GARCH

Volatility persistence

0.8525
81.33***
γ

leverage

Additional response to negative shocks

0.1247
4.52***
δ

power

Transformation power

0.8829
7.37***

Persistence:

0.967

Half-life:

21 days