Skip to main content
V-Lab
V-Lab

Russell 1000 Growth Index GJR-GARCH Volatility Analysis

Volatility prediction for Friday, September 25th, 2026

1 Day

13.57%

decreased by 0.47%

1 Week

13.76%

decreased by 0.28%

1 Month

14.44%

increased by 0.40%

Analysis last updated: Friday, September 25, 2026 at 08:54 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Russell 1000 Growth Index GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 12, 2000 to Sep 18, 2026

Model Insight

This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.

σ

GJR-GARCH Model

Tap to view equation

Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
ωconst0.0220
4.32***
αARCH0.0006
0.04
βGARCH0.9060
84.19***
γleverage0.1556
6.32***

0.984

Persistence

44d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0220
4.32***
α

ARCH

Response to squared shocks

0.0006
0.04
β

GARCH

Volatility persistence

0.9060
84.19***
γ

leverage

Additional response to negative shocks

0.1556
6.32***

Persistence:

0.984

Half-life:

44 days