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V-Lab
V-Lab

Ishares Core Equity ETF PTF GJR-GARCH Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

10.45%

decreased by 0.20%

1 Week

10.72%

increased by 0.07%

1 Month

11.56%

increased by 0.91%

Analysis last updated: Saturday, September 19, 2026 at 09:18 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

All

graph of Ishares Core Equity ETF PTF GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Aug 13, 2019 to Sep 18, 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.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 19-day half-life
ParamValuet-stat
ωconst0.0279
2.56**
αARCH0.0000
0.00
βGARCH0.8831
31.84***
γleverage0.1608
2.68***

0.963

Persistence

19d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0279
2.56**
α

ARCH

Response to squared shocks

0.0000
0.00
β

GARCH

Volatility persistence

0.8831
31.84***
γ

leverage

Additional response to negative shocks

0.1608
2.68***

Persistence:

0.963

Half-life:

19 days