V-Lab
iShares Global Clean Energy ETF GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
24.46%
decreased by 1.09%
1 Week
24.62%
decreased by 0.93%
1 Month
25.19%
decreased by 0.36%
Analysis last updated: Friday, September 11, 2026 at 10:30 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jun 24, 2008 to Sep 11, 2026Model Insight
With persistence 0.991, volatility shocks have a half-life of 73 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 8.14 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
High persistence: persistence 0.991, shock half-life ~73 daysv = 8.14 · fat tails
| Param | Value | t-stat |
|---|---|---|
| ωconst | 3.9793 | 1.39 |
| αARCH | 0.0783 | 7.98*** |
| βGARCH | 0.9905 | 139.02*** |
| νDF | 8.1408 | 1.12 |
0.991
Persistence73d
Half-life𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 3.9793 | 1.39 |
α ARCH Response to squared shocks | 0.0783 | 7.98*** |
β GARCH Volatility persistence | 0.9905 | 139.02*** |
ν DF Student-t tail thickness | 8.1408 | 1.12 |
Persistence:
0.991
Half-life:
73 days
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