Skip to main content
V-Lab
V-Lab

Woolworths Holdings Ltd/South Africa GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, October 7th, 2026

1 Day

29.37%

increased by 0.83%

1 Week

29.62%

increased by 1.08%

1 Month

30.39%

increased by 1.85%

Analysis last updated: Wednesday, October 7, 2026 at 08:11 PM UTC

Press Delete or Backspace to remove this series.
Date Range:

from

10/06/2024

to

10/06/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Woolworths Holdings Ltd/South Africa GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 3, 1997 to Oct 2, 2026

Model Insight

Volatility shocks decay with a half-life of 22 trading days, meaning a shock loses half its impact after approximately 22 days. Returns follow a Student-t distribution with v = 5.40 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 22-day half-lifev = 5.40 · fat tails
ParamValuet-stat
ωconst4.3809
2.37**
αARCH0.0662
5.11***
βGARCH0.9695
78.73***
νDF5.4035
1.38

0.970

Persistence

22d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

4.3809
2.37**
α

ARCH

Response to squared shocks

0.0662
5.11***
β

GARCH

Volatility persistence

0.9695
78.73***
ν

DF

Student-t tail thickness

5.4035
1.38

Persistence:

0.970

Half-life:

22 days