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Tokyo Stock Exchange Tokyo Stock Price Index TOPIX GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, November 4th, 2026

1 Day

15.66%

increased by 0.09%

1 Week

15.89%

increased by 0.32%

1 Month

16.66%

increased by 1.09%

Analysis last updated: Thursday, November 5, 2026 at 12:55 AM UTC

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Date Range:

from

11/03/2024

to

11/03/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Tokyo Stock Exchange Tokyo Stock Price Index TOPIX GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Nov 2, 2026

Model Insight

Volatility shocks decay with a half-life of 31 trading days, meaning a shock loses half its impact after approximately 31 days. Returns follow a Student-t distribution with v = 7.65 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

Shock decay: Shocks decay with a 31-day half-lifev = 7.65 · fat tails
ParamValuet-stat
ωlong-run1.7722
3.46***
αscore0.0972
10.23***
βpersistence0.9778
140.96***
νDF7.6491
1.85*

0.978

Persistence

31d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

long-run

Long-run variance given a price move

1.7722
3.46***
α

score

Weight on the scaled score

0.0972
10.23***
β

persistence

Volatility persistence

0.9778
140.96***
ν

DF

Student-t tail thickness

7.6491
1.85*

Persistence:

0.978

Half-life:

31 days