V-Lab
State Street Energy Select Sector SPDR ETF Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Tuesday, July 28th, 2026
1 Day
21.75%
increased by 1.36%
1 Week
21.86%
increased by 1.47%
1 Month
22.26%
increased by 1.87%
Analysis last updated: Monday, July 27, 2026 at 09:44 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Dec 22, 1998 to Jul 24, 2026Model Insight
With persistence 0.992, volatility shocks have a half-life of 82 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0940 | 6.69*** |
α ARCH Response to squared shocks | 0.0741 | 7.83*** |
β GARCH Volatility persistence | 0.9175 | 97.97*** |
Spline Coefficients
K=1
| γ1 | 0.0003 | 0.71 |
Persistence:
0.992
Half-life:
82 days
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