State Street SPDR S&P Biotech ETF MEM Volatility Analysis
Volatility prediction for Wednesday, July 22nd, 2026
1 Day
34.58%
decreased by 1.52%
1 Week
34.48%
decreased by 1.62%
1 Month
34.15%
decreased by 1.95%
Analysis last updated: Tuesday, July 21, 2026 at 09:54 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Feb 6, 2006 to Jul 17, 2026Model Insight
Volatility shocks decay with a half-life of 30 trading days, meaning a shock loses half its impact after approximately 30 days.
μ
MEM Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0964 | 11.51*** |
α ARCH Response to squared shocks | 0.2095 | 42.95*** |
β GARCH Volatility persistence | 0.7674 | 200.68*** |
Persistence:
0.977
Half-life:
30 days
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