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V-Lab

Ishares Core Equity ETF PTF APARCH Volatility Analysis

Volatility prediction for Wednesday, August 5th, 2026

1 Day

13.10%

decreased by 0.57%

1 Week

13.17%

decreased by 0.50%

1 Month

13.41%

decreased by 0.26%

Analysis last updated: Wednesday, August 5, 2026 at 09:20 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

All

graph of Ishares Core Equity ETF PTF APARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Aug 13, 2019 to Jul 31, 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 = 1.75 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.

σ

APARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0300
13.32***
α

ARCH

Response to squared shocks

0.0483
0.00
β

GARCH

Volatility persistence

0.8886
130.87***
γ

leverage

Additional response to negative shocks

1.0000
0.00
δ

power

Transformation power

1.7494
9.82***

Persistence:

0.963

Half-life:

19 days