V-Lab
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
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 12, 2000 to Sep 25, 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
EGARCH Model
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Leverage: volatility responds almost entirely to negative shocks
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0106 | 0.82 |
| αARCH | 0.1491 | 6.73*** |
| βGARCH | 0.9749 | 197.91*** |
| γleverage | -0.1241 | -6.04*** |
0.975
Persistence27d
Half-lifeσ
EGARCH Model
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| Parameter | Value | t-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
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