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V-Lab

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

Date Range:

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to

6M ·

1Y ·

2Y ·

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graph of iShares Global Clean Energy Index ETF GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 3, 2022 to Jul 10, 2026

Model 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

ParameterValuet-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