V-Lab
Nikkei Stock Average Volatility Index EGARCH Volatility Analysis
Volatility prediction for Monday, September 7th, 2026
1 Day
144.97%
decreased by 4.40%
1 Week
141.38%
decreased by 7.99%
1 Month
131.07%
decreased by 18.30%
Analysis last updated: Saturday, September 12, 2026 at 12:48 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 3, 1990 to Sep 4, 2026Model Insight
This asset shows a rare inverse leverage effect: volatility responds almost entirely to positive returns, rising far more after gains than after losses. This is the reverse of the usual leverage effect, rare among risky assets.
σ
EGARCH Model
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Inverse leverage: volatility responds almost entirely to positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.1510 | 3.23*** |
| αARCH | 0.1485 | 5.00*** |
| βGARCH | 0.9599 | 93.47*** |
| γleverage | 0.1024 | 3.59*** |
0.960
Persistence17d
Half-lifeσ
EGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1510 | 3.23*** |
α ARCH Response to squared shocks | 0.1485 | 5.00*** |
β GARCH Volatility persistence | 0.9599 | 93.47*** |
γ leverage Additional response to negative shocks | 0.1024 | 3.59*** |
Persistence:
0.960
Half-life:
17 days
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