Skip to main content
V-Lab
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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

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

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jun 24, 2008 to Sep 11, 2026

Model 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
ParamValuet-stat
ωconst3.9793
1.39
αARCH0.0783
7.98***
βGARCH0.9905
139.02***
νDF8.1408
1.12

0.991

Persistence

73d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-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