V-Lab
Russell 1000 Value Index GJR-GARCH Volatility Analysis
Volatility prediction for Tuesday, September 15th, 2026
1 Day
10.95%
decreased by 0.37%
1 Week
11.24%
decreased by 0.08%
1 Month
12.18%
increased by 0.86%
Analysis last updated: Tuesday, September 15, 2026 at 12:04 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 12, 2000 to Sep 11, 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 | 0.0238 | 4.79*** |
| αARCH | 0.0033 | 0.33 |
| βGARCH | 0.8871 | 98.43*** |
| γleverage | 0.1742 | 7.66*** |
0.977
Persistence30d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0238 | 4.79*** |
α ARCH Response to squared shocks | 0.0033 | 0.33 |
β GARCH Volatility persistence | 0.8871 | 98.43*** |
γ leverage Additional response to negative shocks | 0.1742 | 7.66*** |
Persistence:
0.977
Half-life:
30 days
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