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V-Lab

PSI 20 Portuguese Stock Index EGARCH Volatility Analysis

Volatility prediction for Friday, September 18th, 2026

1 Day

14.04%

increased by 0.77%

1 Week

14.27%

increased by 1.00%

1 Month

15.03%

increased by 1.76%

Analysis last updated: Thursday, September 17, 2026 at 05:48 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of PSI 20 Portuguese Stock Index EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Dec 30, 1992 to Sep 11, 2026

Model Insight

This asset exhibits a notable leverage effect: negative returns increase next-day volatility 72% more than equivalent positive returns.

σ

EGARCH Model

Tap to view equation

Leverage: Negative returns increase volatility 72% more than positive returns
ParamValuet-stat
ωconst0.0080
1.80*
αARCH0.2351
13.87***
βGARCH0.9661
207.00***
γleverage-0.0624
-4.06***

0.966

Persistence

20d

Half-life
σ

EGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0080
1.80*
α

ARCH

Response to squared shocks

0.2351
13.87***
β

GARCH

Volatility persistence

0.9661
207.00***
γ

leverage

Additional response to negative shocks

-0.0624
-4.06***

Persistence:

0.966

Half-life:

20 days