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V-Lab
V-Lab

Tokyo Stock Exchange Tokyo Stock Price Index TOPIX Spline-GARCH Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

16.61%

decreased by 0.99%

1 Week

16.82%

decreased by 0.78%

1 Month

17.48%

decreased by 0.12%

Analysis last updated: Friday, September 11, 2026 at 05:40 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Tokyo Stock Exchange Tokyo Stock Price Index TOPIX SGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 7, 2026

Model Insight

This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 20 trading days.

τ

Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst1.0044
9.85***
αARCH0.1214
10.27***
βGARCH0.8446
68.40***
γi Spline Coefficients
K=1
γ1-0.0002
-0.52

0.966

Persistence

20d

Half-life
τ

Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.0044
9.85***
α

ARCH

Response to squared shocks

0.1214
10.27***
β

GARCH

Volatility persistence

0.8446
68.40***
γi Spline Coefficients
K=1
γ1-0.0002
-0.52

Persistence:

0.966

Half-life:

20 days