iShares Global Clean Energy Index ETF GAS-GARCH Student T Volatility Analysis
Volatility prediction for Wednesday, July 15th, 2026
1 Day
49.01%
decreased by 0.42%
1 Week
49.05%
decreased by 0.38%
1 Month
49.18%
decreased by 0.25%
Analysis last updated: Wednesday, July 15, 2026 at 09:11 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 3, 2022 to Jul 10, 2026Model Insight
With persistence 0.999, volatility shocks have a half-life of 693 trading days (~2.7 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 4.49 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 15.9447 | 9.84*** |
α ARCH Response to squared shocks | 0.0358 | 19.87*** |
β GARCH Volatility persistence | 0.9990 | 1,302.48*** |
ν DF Student-t tail thickness | 4.4887 | 5.27*** |
Persistence:
0.999
Half-life:
693 days
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