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V-Lab

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

Volatility prediction for Tuesday, August 25th, 2026

1 Day

28.53%

decreased by 0.54%

1 Week

28.82%

decreased by 0.25%

1 Month

29.77%

increased by 0.70%

Analysis last updated: Tuesday, August 25, 2026 at 08:13 PM UTC

Date Range:

from

to

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 Aug 21, 2026

Model Insight

Volatility shocks decay with a half-life of 23 trading days, meaning a shock loses half its impact after approximately 23 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

ParameterValuet-statistic
ω

const

Unconditional variance weight

4.3843
9.36***
α

ARCH

Response to squared shocks

0.0657
20.41***
β

GARCH

Volatility persistence

0.9701
315.78***
ν

DF

Student-t tail thickness

5.3960
5.51***

Persistence:

0.970

Half-life:

23 days