V-Lab
Russell 1000 Growth Index GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 25th, 2026
1 Day
13.57%
decreased by 0.47%
1 Week
13.76%
decreased by 0.28%
1 Month
14.44%
increased by 0.40%
Analysis last updated: Friday, September 25, 2026 at 08:54 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 12, 2000 to Sep 18, 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 | 0.0220 | 4.32*** |
| αARCH | 0.0006 | 0.04 |
| βGARCH | 0.9060 | 84.19*** |
| γleverage | 0.1556 | 6.32*** |
0.984
Persistence44d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0220 | 4.32*** |
α ARCH Response to squared shocks | 0.0006 | 0.04 |
β GARCH Volatility persistence | 0.9060 | 84.19*** |
γ leverage Additional response to negative shocks | 0.1556 | 6.32*** |
Persistence:
0.984
Half-life:
44 days
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