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State Street Utilities Select Sector SPDR ETF MEM Volatility Analysis

Volatility prediction for Monday, September 14th, 2026

1 Day

15.76%

unchanged at 0.00%

1 Week

15.97%

increased by 0.21%

1 Month

16.69%

increased by 0.93%

Analysis last updated: Saturday, September 12, 2026 at 12:04 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street Utilities 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 Sep 11, 2026

Model Insight

Volatility shocks decay with a half-life of 32 trading days, meaning a shock loses half its impact after approximately 32 days.

μ

MEM Model

Tap to view equation

Shock decay: Shocks decay with a 32-day half-life
ParamValuet-stat
ωconst0.0347
2.01**
αARCH0.2125
9.74***
βGARCH0.7660
54.26***

0.979

Persistence

32d

Half-life
μ

MEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0347
2.01**
α

ARCH

Response to squared shocks

0.2125
9.74***
β

GARCH

Volatility persistence

0.7660
54.26***

Persistence:

0.979

Half-life:

32 days