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V-Lab

CBOE S&P 500 6-Month Volatility Index EGARCH Volatility Analysis

Volatility prediction for Friday, August 14th, 2026

1 Day

34.82%

increased by 0.27%

1 Week

36.30%

increased by 1.75%

1 Month

40.68%

increased by 6.13%

Analysis last updated: Friday, August 14, 2026 at 11:32 AM UTC

Date Range:

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to

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graph of CBOE S&P 500 6-Month Volatility Index EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 2008 to Aug 7, 2026

Model Insight

This asset shows a rare inverse leverage effect: volatility responds almost entirely to positive returns, rising far more after gains than after losses. This is the reverse of the usual leverage effect, rare among risky assets.

σ

EGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.1437
9.17***
α

ARCH

Response to squared shocks

0.1443
17.78***
β

GARCH

Volatility persistence

0.9362
231.61***
γ

leverage

Additional response to negative shocks

0.2129
26.22***

Persistence:

0.936

Half-life:

11 days