State Street Health Care Select Sector SPDR ETF EGARCH Volatility Analysis
Volatility prediction for Tuesday, July 21st, 2026
1 Day
20.19%
increased by 1.29%
1 Week
20.03%
increased by 1.13%
1 Month
19.50%
increased by 0.60%
Analysis last updated: Monday, July 20, 2026 at 09:52 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Dec 22, 1998 to Jul 17, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 354% more than equivalent positive returns.
σ
EGARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0069 | 3.11*** |
α ARCH Response to squared shocks | 0.1739 | 31.20*** |
β GARCH Volatility persistence | 0.9679 | 688.86*** |
γ leverage Additional response to negative shocks | -0.1112 | -24.83*** |
Persistence:
0.968
Half-life:
21 days
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