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V-Lab

Stock Exchange of Thailand SET Index Spline-GARCH Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

13.90%

decreased by 0.45%

1 Week

14.45%

increased by 0.10%

1 Month

16.08%

increased by 1.73%

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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Stock Exchange of Thailand SET Index 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 19 trading days.

τ

Spline-GARCH Model

Tap to view equation

Time-varying baseline: volatility reverts to a slowly-shifting spline trend
ParamValuet-stat
ωconst1.2734
6.21***
αARCH0.1022
9.64***
βGARCH0.8612
60.75***
γi Spline Coefficients
K=9
γ10.0225
0.77
γ20.0192
0.43
γ3-0.1442
-4.14***
γ40.2125
5.32***
γ5-0.2007
-2.90***
γ60.1141
1.33
γ70.0104
0.16
γ8-0.0530
-0.97
γ90.0625
1.04

0.963

Persistence

19d

Half-life
τ

Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.2734
6.21***
α

ARCH

Response to squared shocks

0.1022
9.64***
β

GARCH

Volatility persistence

0.8612
60.75***
γi Spline Coefficients
K=9
γ10.0225
0.77
γ20.0192
0.43
γ3-0.1442
-4.14***
γ40.2125
5.32***
γ5-0.2007
-2.90***
γ60.1141
1.33
γ70.0104
0.16
γ8-0.0530
-0.97
γ90.0625
1.04

Persistence:

0.963

Half-life:

19 days