V-Lab
NASDAQ Composite Index EGARCH Volatility Analysis
Volatility prediction for Wednesday, September 23rd, 2026
1 Day
15.14%
decreased by 0.66%
1 Week
15.42%
decreased by 0.38%
1 Month
16.42%
increased by 0.62%
Analysis last updated: Wednesday, September 23, 2026 at 12:04 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Sep 18, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 245% more than equivalent positive returns.
σ
EGARCH Model
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Leverage: Negative returns increase volatility 245% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0161 | 2.53** |
| αARCH | 0.1712 | 11.71*** |
| βGARCH | 0.9755 | 278.63*** |
| γleverage | -0.0943 | -6.61*** |
0.975
Persistence28d
Half-lifeσ
EGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0161 | 2.53** |
α ARCH Response to squared shocks | 0.1712 | 11.71*** |
β GARCH Volatility persistence | 0.9755 | 278.63*** |
γ leverage Additional response to negative shocks | -0.0943 | -6.61*** |
Persistence:
0.975
Half-life:
28 days
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