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S&P MidCap 400 Index MEM Volatility Analysis

Volatility prediction for Tuesday, October 27th, 2026

1 Day

12.71%

decreased by 0.26%

1 Week

13.00%

increased by 0.03%

1 Month

14.02%

increased by 1.05%

Analysis last updated: Monday, October 26, 2026 at 11:01 PM UTC

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Date Range:

from

10/26/2024

to

10/26/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of S&P MidCap 400 Index MEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jun 3, 1991 to Oct 23, 2026

Model Insight

Volatility shocks decay with a half-life of 47 trading days, meaning a shock loses half its impact after approximately 47 days.

μ

MEM Model

Tap to view equation

Shock decay: Shocks decay with a 47-day half-life
ParamValuet-stat
ωconst0.0245
3.88***
αARCH0.1990
15.00***
βGARCH0.7864
65.71***

0.985

Persistence

47d

Half-life
μ

MEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0245
3.88***
α

ARCH

Response to squared shocks

0.1990
15.00***
β

GARCH

Volatility persistence

0.7864
65.71***

Persistence:

0.985

Half-life:

47 days