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V-Lab

CBOE S&P 500 9-Day Volatility Index GARCH Volatility Analysis

Volatility prediction for Tuesday, July 21st, 2026

1 Day

219.39%

decreased by 4.22%

1 Week

218.44%

decreased by 5.17%

1 Month

215.31%

decreased by 8.30%

Analysis last updated: Tuesday, July 21, 2026 at 12:02 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of CBOE S&P 500 9-Day Volatility Index GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 3, 2011 to Jul 17, 2026

Model Insight

Volatility shocks decay with a half-life of 22 trading days, meaning a shock loses half its impact after approximately 22 days.

σ

GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

5.0000
12.80***
α

ARCH

Response to squared shocks

0.0374
15.90***
β

GARCH

Volatility persistence

0.9320
231.95***

Persistence:

0.969

Half-life:

22 days