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V-Lab

State Street SPDR S&P 500 ETF Trust Asy. MEM Volatility Analysis

Volatility prediction for Monday, August 10th, 2026

1 Day

12.21%

decreased by 1.36%

1 Week

12.52%

decreased by 1.05%

1 Month

13.48%

decreased by 0.09%

Analysis last updated: Friday, August 7, 2026 at 10:41 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street SPDR S&P 500 ETF Trust AMEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Mar 15, 2004 to Aug 7, 2026

Model Insight

This asset exhibits a strong leverage effect: negative returns increase next-day volatility 188% more than equivalent positive returns.

μ

AMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0341
36.62***
α

ARCH

Response to squared shocks

0.1229
17.63***
β

GARCH

Volatility persistence

0.7305
165.08***
γ

leverage

Additional response to negative shocks

0.2308
20.90***

Persistence:

0.969

Half-life:

22 days