Skip to main content
V-Lab
V-Lab

KOSPI 200 Volatility Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

105.33%

decreased by 7.27%

1 Week

102.52%

decreased by 10.08%

1 Month

95.67%

decreased by 16.93%

Analysis last updated: Saturday, September 12, 2026 at 12:50 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of KOSPI 200 Volatility Index GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 2003 to Sep 10, 2026

Model Insight

Volatility shocks decay with a half-life of 7 trading days, meaning a shock loses half its impact after approximately 7 days. Returns follow a Student-t distribution with v = 4.79 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 7-day half-lifev = 4.79 · fat tails
ParamValuet-stat
ωconst29.7349
2.92***
αARCH0.1375
5.22***
βGARCH0.9114
27.62***
νDF4.7892
1.82*

0.911

Persistence

7d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

29.7349
2.92***
α

ARCH

Response to squared shocks

0.1375
5.22***
β

GARCH

Volatility persistence

0.9114
27.62***
ν

DF

Student-t tail thickness

4.7892
1.82*

Persistence:

0.911

Half-life:

7 days