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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

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graph of Tokyo Stock Exchange Tokyo Stock Price Index TOPIX GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 22, 2026

Model 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
ParamValuet-stat
ωconst0.0587
7.07***
αARCH0.0329
2.92***
βGARCH0.8571
89.71***
γleverage0.1457
4.92***

0.963

Persistence

18d

Half-life
σ

GJR-GARCH Model

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ParameterValuet-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