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Russell 1000 Growth Index EGARCH Volatility Analysis

Volatility prediction for Monday, September 28th, 2026

1 Day

14.67%

decreased by 0.71%

1 Week

14.88%

decreased by 0.50%

1 Month

15.63%

increased by 0.25%

Analysis last updated: Saturday, September 26, 2026 at 09:02 AM UTC

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graph of Russell 1000 Growth Index EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 12, 2000 to Sep 25, 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

EGARCH Model

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Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
ωconst0.0106
0.82
αARCH0.1491
6.73***
βGARCH0.9749
197.91***
γleverage-0.1241
-6.04***

0.975

Persistence

27d

Half-life
σ

EGARCH Model

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ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0106
0.82
α

ARCH

Response to squared shocks

0.1491
6.73***
β

GARCH

Volatility persistence

0.9749
197.91***
γ

leverage

Additional response to negative shocks

-0.1241
-6.04***

Persistence:

0.975

Half-life:

27 days