V-Lab
S&P 100 Index EGARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
13.24%
increased by 0.29%
1 Week
13.44%
increased by 0.49%
1 Month
14.16%
increased by 1.21%
Analysis last updated: Thursday, September 10, 2026 at 11:01 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Sep 4, 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 | 0.0054 | 0.54 |
| αARCH | 0.1521 | 9.40*** |
| βGARCH | 0.9717 | 173.58*** |
| γleverage | -0.1203 | -6.78*** |
0.972
Persistence24d
Half-lifeσ
EGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0054 | 0.54 |
α ARCH Response to squared shocks | 0.1521 | 9.40*** |
β GARCH Volatility persistence | 0.9717 | 173.58*** |
γ leverage Additional response to negative shocks | -0.1203 | -6.78*** |
Persistence:
0.972
Half-life:
24 days
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