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V-Lab

CAC 40 Index GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, August 26th, 2026

1 Day

10.51%

decreased by 0.38%

1 Week

10.90%

increased by 0.01%

1 Month

12.23%

increased by 1.34%

Analysis last updated: Tuesday, August 25, 2026 at 04:03 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of CAC 40 Index GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Aug 21, 2026

Model Insight

Volatility shocks decay with a half-life of 53 trading days, meaning a shock loses half its impact after approximately 53 days. Returns follow a Student-t distribution with v = 8.12 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

1.7435
8.44***
α

ARCH

Response to squared shocks

0.0818
35.93***
β

GARCH

Volatility persistence

0.9871
579.29***
ν

DF

Student-t tail thickness

8.1161
6.18***

Persistence:

0.987

Half-life:

53 days