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V-Lab

CBOE Volatility Index GJR-GARCH Volatility Analysis

Volatility prediction for Friday, August 21st, 2026

1 Day

101.28%

increased by 11.44%

1 Week

101.62%

increased by 11.78%

1 Month

102.32%

increased by 12.48%

Analysis last updated: Friday, August 21, 2026 at 11:34 AM UTC

Date Range:

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to

6M ·

1Y ·

2Y ·

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10Y ·

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graph of CBOE Volatility 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 Aug 14, 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

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

4.7057
19.88***
α

ARCH

Response to squared shocks

0.2064
19.94***
β

GARCH

Volatility persistence

0.7849
145.55***
γ

leverage

Additional response to negative shocks

-0.2064
-19.41***

Persistence:

0.888

Half-life:

6 days