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V-Lab

S&P 100 Index GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 8th, 2026

1 Day

10.85%

increased by 0.28%

1 Week

11.13%

increased by 0.56%

1 Month

12.09%

increased by 1.52%

Analysis last updated: Friday, September 4, 2026 at 11:29 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P 100 Index GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Sep 4, 2026

Model Insight

This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.

σ

GJR-GARCH Model

Tap to view equation

Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
ωconst0.0208
4.92***
αARCH0.0050
0.54
βGARCH0.9019
94.19***
γleverage0.1507
6.94***

0.982

Persistence

39d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0208
4.92***
α

ARCH

Response to squared shocks

0.0050
0.54
β

GARCH

Volatility persistence

0.9019
94.19***
γ

leverage

Additional response to negative shocks

0.1507
6.94***

Persistence:

0.982

Half-life:

39 days