Russell 1000 Growth Index GJR-GARCH Volatility Analysis
Volatility prediction for Wednesday, October 21st, 2026
1 Day
20.83%
decreased by 0.87%
1 Week
20.77%
decreased by 0.93%
1 Month
20.58%
decreased by 1.12%
Analysis last updated: Wednesday, October 21, 2026 at 09:02 AM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 12, 2000 to Oct 16, 2026Model 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
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Leverage: volatility responds almost entirely to negative shocks
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0221 | 4.32*** |
| αARCH | 0.0005 | 0.03 |
| βGARCH | 0.9062 | 84.57*** |
| γleverage | 0.1556 | 6.37*** |
0.985
Persistence45d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0221 | 4.32*** |
α ARCH Response to squared shocks | 0.0005 | 0.03 |
β GARCH Volatility persistence | 0.9062 | 84.57*** |
γ leverage Additional response to negative shocks | 0.1556 | 6.37*** |
Persistence:
0.985
Half-life:
45 days
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