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V-Lab

FTSE 100 Index Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Tuesday, July 21st, 2026

1 Day

10.84%

increased by 0.22%

1 Week

11.11%

increased by 0.49%

1 Month

12.02%

increased by 1.40%

Analysis last updated: Monday, July 20, 2026 at 05:03 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of FTSE 100 Index S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Jul 17, 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 34 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.9776
10.29***
α

ARCH

Response to squared shocks

0.1045
11.37***
β

GARCH

Volatility persistence

0.8752
91.12***
γi Spline Coefficients
K=1
γ10.0000
0.16

Persistence:

0.980

Half-life:

34 days