State Street Health Care Select Sector SPDR ETF GJR-GARCH Volatility Analysis
Volatility prediction for Monday, October 12th, 2026
1 Day
13.94%
increased by 0.03%
1 Week
14.16%
increased by 0.25%
1 Month
14.89%
increased by 0.98%
Analysis last updated: Saturday, October 10, 2026 at 02:07 AM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Dec 22, 1998 to Oct 9, 2026Model Insight
This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.
σ
GJR-GARCH Model
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Leverage: volatility responds almost entirely to negative shocks
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0294 | 5.21*** |
| αARCH | 0.0260 | 2.11** |
| βGARCH | 0.8833 | 72.66*** |
| γleverage | 0.1373 | 4.35*** |
0.978
Persistence31d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0294 | 5.21*** |
α ARCH Response to squared shocks | 0.0260 | 2.11** |
β GARCH Volatility persistence | 0.8833 | 72.66*** |
γ leverage Additional response to negative shocks | 0.1373 | 4.35*** |
Persistence:
0.978
Half-life:
31 days
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