V-Lab
S&P 100 Index EGARCH Volatility Analysis
Volatility prediction for Monday, September 28th, 2026
1 Day
11.94%
decreased by 0.49%
1 Week
12.19%
decreased by 0.24%
1 Month
13.10%
increased by 0.67%
Analysis last updated: Saturday, September 26, 2026 at 12:53 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 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 | 0.0054 | 0.54 |
| αARCH | 0.1520 | 9.40*** |
| βGARCH | 0.9717 | 173.86*** |
| γleverage | -0.1203 | -6.79*** |
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 | 0.1520 | 9.40*** |
β GARCH Volatility persistence | 0.9717 | 173.86*** |
γ leverage Additional response to negative shocks | -0.1203 | -6.79*** |
Persistence:
0.972
Half-life:
24 days
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