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Dow Jones South Africa Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Friday, September 11th, 2026

1 Day

16.92%

increased by 0.30%

1 Week

16.96%

increased by 0.34%

1 Month

17.10%

increased by 0.48%

Analysis last updated: Saturday, September 12, 2026 at 12:51 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Dow Jones South Africa Index GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1992 to Sep 10, 2026

Model Insight

Volatility shocks decay with a half-life of 34 trading days, meaning a shock loses half its impact after approximately 34 days. Returns follow a Student-t distribution with v = 7.03 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 34-day half-lifev = 7.03 · fat tails
ParamValuet-stat
ωconst1.2712
3.02***
αARCH0.0791
8.62***
βGARCH0.9800
146.93***
νDF7.0311
1.78*

0.980

Persistence

34d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.2712
3.02***
α

ARCH

Response to squared shocks

0.0791
8.62***
β

GARCH

Volatility persistence

0.9800
146.93***
ν

DF

Student-t tail thickness

7.0311
1.78*

Persistence:

0.980

Half-life:

34 days