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V-Lab

Russell 2000 Index GJR-GARCH Volatility Analysis

Volatility prediction for Wednesday, August 26th, 2026

1 Day

14.87%

decreased by 0.56%

1 Week

15.04%

decreased by 0.39%

1 Month

15.68%

increased by 0.25%

Analysis last updated: Wednesday, August 26, 2026 at 12:04 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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graph of Russell 2000 Index GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Aug 21, 2026

Model Insight

With persistence 0.991, volatility shocks have a half-life of 78 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Leverage: Negative returns increase volatility 282% more than positive returns

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0182
23.53***
α

ARCH

Response to squared shocks

0.0381
18.92***
β

GARCH

Volatility persistence

0.8993
550.69***
γ

leverage

Additional response to negative shocks

0.1074
22.89***

Persistence:

0.991

Half-life:

78 days