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Korea Stock Exchange KOSPI Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Monday, November 2nd, 2026

1 Day

53.39%

increased by 1.30%

1 Week

53.23%

increased by 1.14%

1 Month

52.58%

increased by 0.49%

Analysis last updated: Friday, October 30, 2026 at 09:10 AM UTC

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Date Range:

from

10/30/2024

to

10/30/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Korea Stock Exchange KOSPI Index 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 Oct 30, 2026

Model Insight

With persistence 0.996, volatility shocks have a half-life of 157 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 7.52 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

High persistence: persistence 0.996, shock half-life ~157 daysv = 7.52 · fat tails
ParamValuet-stat
ωlong-run3.3516
1.44
αscore0.0786
13.23***
βpersistence0.9956
345.21***
νDF7.5162
2.28**

0.996

Persistence

157d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

long-run

Long-run variance given a price move

3.3516
1.44
α

score

Weight on the scaled score

0.0786
13.23***
β

persistence

Volatility persistence

0.9956
345.21***
ν

DF

Student-t tail thickness

7.5162
2.28**

Persistence:

0.996

Half-life:

157 days