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OMX Copenhagen 20 Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

15.60%

decreased by 0.71%

1 Week

15.70%

decreased by 0.61%

1 Month

16.10%

decreased by 0.21%

Analysis last updated: Saturday, September 19, 2026 at 05:47 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of OMX Copenhagen 20 Index GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Sep 18, 2026

Model Insight

Volatility shocks decay with a half-life of 54 trading days, meaning a shock loses half its impact after approximately 54 days. Returns follow a Student-t distribution with v = 6.11 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 54-day half-lifev = 6.11 · fat tails
ParamValuet-stat
ωconst1.5071
1.79*
αARCH0.0728
7.92***
βGARCH0.9873
135.10***
νDF6.1116
2.10**

0.987

Persistence

54d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.5071
1.79*
α

ARCH

Response to squared shocks

0.0728
7.92***
β

GARCH

Volatility persistence

0.9873
135.10***
ν

DF

Student-t tail thickness

6.1116
2.10**

Persistence:

0.987

Half-life:

54 days