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V-Lab

Sam Holdings Corporation APARCH Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

21.10%

decreased by 0.86%

1 Week

22.87%

increased by 0.91%

1 Month

28.16%

increased by 6.20%

Analysis last updated: Friday, September 11, 2026 at 09:46 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

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10Y ·

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graph of Sam Holdings Corporation APARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Mar 21, 2007 to Sep 4, 2026

Model Insight

Volatility shocks decay with a half-life of 19 trading days, meaning a shock loses half its impact after approximately 19 days. The volatility power δ = 1.46 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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Shock decay: Shocks decay with a 19-day half-lifeδ = 1.46 · sub-quadratic power
ParamValuet-stat
ωconst0.1515
4.82***
αARCH0.1570
9.73***
βGARCH0.8300
46.90***
γleverage0.0194
0.36
δpower1.4552
6.41***

0.964

Persistence

19d

Half-life
σ

APARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.1515
4.82***
α

ARCH

Response to squared shocks

0.1570
9.73***
β

GARCH

Volatility persistence

0.8300
46.90***
γ

leverage

Additional response to negative shocks

0.0194
0.36
δ

power

Transformation power

1.4552
6.41***

Persistence:

0.964

Half-life:

19 days