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State Street Health Care Select Sector SPDR ETF Asy. MEM Volatility Analysis

Volatility prediction for Thursday, October 15th, 2026

1 Day

19.42%

decreased by 0.35%

1 Week

19.38%

decreased by 0.39%

1 Month

19.21%

decreased by 0.56%

Analysis last updated: Wednesday, October 14, 2026 at 10:39 PM UTC

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Date Range:

from

10/14/2024

to

10/14/2026

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street Health Care Select Sector SPDR ETF AMEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Dec 22, 1998 to Oct 9, 2026

Model Insight

This asset exhibits a strong leverage effect: negative returns increase next-day volatility 112% more than equivalent positive returns.

μ

AMEM Model

Tap to view equation

Leverage: Negative returns increase volatility 112% more than positive returns
ParamValuet-stat
ωconst0.0251
6.93***
αARCH0.1096
7.47***
βGARCH0.8099
73.63***
γleverage0.1225
4.43***

0.981

Persistence

36d

Half-life
μ

AMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0251
6.93***
α

ARCH

Response to squared shocks

0.1096
7.47***
β

GARCH

Volatility persistence

0.8099
73.63***
γ

leverage

Additional response to negative shocks

0.1225
4.43***

Persistence:

0.981

Half-life:

36 days