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State Street Energy Select Sector SPDR ETF MEM Volatility Analysis

Volatility prediction for Friday, October 9th, 2026

1 Day

23.46%

decreased by 0.62%

1 Week

23.68%

decreased by 0.40%

1 Month

24.47%

increased by 0.39%

Analysis last updated: Thursday, October 8, 2026 at 09:59 PM UTC

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Date Range:

from

10/08/2024

to

10/08/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street Energy Select Sector SPDR ETF MEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Dec 22, 1998 to Oct 2, 2026

Model Insight

Volatility shocks decay with a half-life of 50 trading days, meaning a shock loses half its impact after approximately 50 days.

μ

MEM Model

Tap to view equation

Shock decay: Shocks decay with a 50-day half-life
ParamValuet-stat
ωconst0.0513
2.04**
αARCH0.2021
11.13***
βGARCH0.7841
51.60***

0.986

Persistence

50d

Half-life
μ

MEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0513
2.04**
α

ARCH

Response to squared shocks

0.2021
11.13***
β

GARCH

Volatility persistence

0.7841
51.60***

Persistence:

0.986

Half-life:

50 days