Tokyo Stock Exchange Tokyo Stock Price Index TOPIX GJR-GARCH Volatility Analysis
Volatility prediction for Thursday, October 15th, 2026
1 Day
15.47%
decreased by 0.53%
1 Week
15.83%
decreased by 0.17%
1 Month
16.93%
increased by 0.93%
Analysis last updated: Thursday, October 15, 2026 at 05:59 PM UTC
Press Delete or Backspace to remove this series.
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Oct 9, 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
Tap to view equation
Leverage: volatility responds almost entirely to negative shocks
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0587 | 7.08*** |
| αARCH | 0.0328 | 2.92*** |
| βGARCH | 0.8572 | 89.81*** |
| γleverage | 0.1457 | 4.92*** |
0.963
Persistence18d
Half-lifeσ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0587 | 7.08*** |
α ARCH Response to squared shocks | 0.0328 | 2.92*** |
β GARCH Volatility persistence | 0.8572 | 89.81*** |
γ leverage Additional response to negative shocks | 0.1457 | 4.92*** |
Persistence:
0.963
Half-life:
18 days
Other Tokyo Stock Exchange Tokyo Stock Price Index TOPIX Analyses
Other GJR-GARCH Analyses on Equity Indices