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V-Lab

Russell 1000 Growth Index GARCH Volatility Analysis

Volatility prediction for Wednesday, September 16th, 2026

1 Day

14.44%

decreased by 0.44%

1 Week

14.63%

decreased by 0.25%

1 Month

15.30%

increased by 0.42%

Analysis last updated: Wednesday, September 16, 2026 at 09:03 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Russell 1000 Growth Index GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 12, 2000 to Sep 11, 2026

Model Insight

Volatility shocks decay with a half-life of 56 trading days, meaning a shock loses half its impact after approximately 56 days.

σ

GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 56-day half-life
ParamValuet-stat
ωconst0.0211
4.33***
αARCH0.1051
10.50***
βGARCH0.8827
88.54***

0.988

Persistence

56d

Half-life
σ

GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0211
4.33***
α

ARCH

Response to squared shocks

0.1051
10.50***
β

GARCH

Volatility persistence

0.8827
88.54***

Persistence:

0.988

Half-life:

56 days