iShares Global Clean Energy Index ETF Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, July 20th, 2026
1 Day
33.13%
unchanged at 0.00%
1 Week
33.13%
unchanged at 0.00%
1 Month
33.13%
unchanged at 0.00%
Analysis last updated: Saturday, July 18, 2026 at 09:58 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 3, 2022 to Jul 17, 2026Model Insight
This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 1 trading day.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.0087 | 6.21*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.5867 | 2.36** |
Spline Coefficients
K=2
| γ1 | 1.4814 | 5.35*** |
| γ2 | -1.7465 | -5.16*** |
Persistence:
0.587
Half-life:
1 days
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