V-Lab
State Street Health Care Select Sector SPDR ETF GJR-GARCH Volatility Analysis
Volatility prediction for Wednesday, October 7th, 2026
1 Day
14.64%
decreased by 0.62%
1 Week
14.82%
decreased by 0.44%
1 Month
15.42%
increased by 0.16%
Analysis last updated: Tuesday, October 6, 2026 at 09:55 PM 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 2, 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 | 0.0261 | 2.11** |
| βGARCH | 0.8832 | 72.63*** |
| γleverage | 0.1374 | 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 | 0.0261 | 2.11** |
β GARCH Volatility persistence | 0.8832 | 72.63*** |
γ leverage Additional response to negative shocks | 0.1374 | 4.35*** |
Persistence:
0.978
Half-life:
31 days
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