iShares Russell 3000 ETF GJR-GARCH Volatility Analysis
Volatility prediction for Tuesday, July 21st, 2026
1 Day
12.62%
decreased by 0.39%
1 Week
12.86%
decreased by 0.15%
1 Month
13.67%
increased by 0.66%
Analysis last updated: Monday, July 20, 2026 at 09:43 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 29, 2000 to Jul 17, 2026Model Insight
Volatility shocks decay with a half-life of 30 trading days, meaning a shock loses half its impact after approximately 30 days.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0268 | 16.91*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8859 | 340.33*** |
γ leverage Additional response to negative shocks | 0.1831 | 25.92*** |
Persistence:
0.977
Half-life:
30 days
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