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V-Lab

Woolworths Holdings Ltd/South Africa Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Wednesday, August 5th, 2026

1 Day

29.03%

decreased by 0.96%

1 Week

29.32%

decreased by 0.67%

1 Month

30.16%

increased by 0.17%

Analysis last updated: Wednesday, August 5, 2026 at 08:03 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Woolworths Holdings Ltd/South Africa S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 3, 1997 to Jul 31, 2026

Model Insight

This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 14 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.5016
11.25***
α

ARCH

Response to squared shocks

0.0697
7.45***
β

GARCH

Volatility persistence

0.8804
54.26***
γi Spline Coefficients
K=2
γ10.0060
4.50***
γ2-0.0068
-4.07***

Persistence:

0.950

Half-life:

14 days