V-Lab
Tokyo Stock Exchange Tokyo Stock Price Index TOPIX GJR-GARCH Volatility Analysis
Volatility prediction for Friday, September 25th, 2026
1 Day
13.52%
decreased by 0.19%
1 Week
14.07%
increased by 0.36%
1 Month
15.71%
increased by 2.00%
Analysis last updated: Friday, September 25, 2026 at 05:40 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 22, 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 | 0.0587 | 7.07*** |
| αARCH | 0.0329 | 2.92*** |
| βGARCH | 0.8571 | 89.71*** |
| γleverage | 0.1457 | 4.92*** |
0.963
Persistence18d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0587 | 7.07*** |
α ARCH Response to squared shocks | 0.0329 | 2.92*** |
β GARCH Volatility persistence | 0.8571 | 89.71*** |
γ leverage Additional response to negative shocks | 0.1457 | 4.92*** |
Persistence:
0.963
Half-life:
18 days
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