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V-Lab

IBEX 35 Index GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 15th, 2026

1 Day

16.46%

increased by 2.02%

1 Week

16.72%

increased by 2.28%

1 Month

17.57%

increased by 3.13%

Analysis last updated: Monday, September 14, 2026 at 04:04 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of IBEX 35 Index GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Sep 11, 2026

Model Insight

This asset exhibits a strong leverage effect: negative returns increase next-day volatility 397% more than equivalent positive returns.

σ

GJR-GARCH Model

Tap to view equation

Leverage: Negative returns increase volatility 397% more than positive returns
ParamValuet-stat
ωconst0.0436
5.70***
αARCH0.0318
2.75***
βGARCH0.8809
105.33***
γleverage0.1259
5.22***

0.976

Persistence

28d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0436
5.70***
α

ARCH

Response to squared shocks

0.0318
2.75***
β

GARCH

Volatility persistence

0.8809
105.33***
γ

leverage

Additional response to negative shocks

0.1259
5.22***

Persistence:

0.976

Half-life:

28 days