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V-Lab

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

Volatility prediction for Tuesday, July 21st, 2026

1 Day

36.25%

increased by 2.74%

1 Week

36.01%

increased by 2.50%

1 Month

35.18%

increased by 1.67%

Analysis last updated: Monday, July 20, 2026 at 09:52 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street SPDR S&P Biotech ETF AMEM

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Feb 6, 2006 to Jul 17, 2026

Model Insight

This asset exhibits a notable leverage effect: negative returns increase next-day volatility 81% more than equivalent positive returns.

μ

AMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0932
29.66***
α

ARCH

Response to squared shocks

0.1339
29.44***
β

GARCH

Volatility persistence

0.7869
219.92***
γ

leverage

Additional response to negative shocks

0.1091
14.10***

Persistence:

0.975

Half-life:

28 days