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S&P 500 Equal Weight Index (EWI) EGARCH Volatility Analysis

Volatility prediction for Tuesday, September 8th, 2026

1 Day

12.15%

increased by 0.46%

1 Week

12.35%

increased by 0.66%

1 Month

13.07%

increased by 1.38%

Analysis last updated: Friday, September 4, 2026 at 11:31 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P 500 Equal Weight Index (EWI) EGARCH

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

EGARCH Model

Tap to view equation

Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
ωconst0.0050
0.70
αARCH0.1489
10.77***
βGARCH0.9791
270.86***
γleverage-0.1052
-8.50***

0.979

Persistence

33d

Half-life
σ

EGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0050
0.70
α

ARCH

Response to squared shocks

0.1489
10.77***
β

GARCH

Volatility persistence

0.9791
270.86***
γ

leverage

Additional response to negative shocks

-0.1052
-8.50***

Persistence:

0.979

Half-life:

33 days