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Ishares S&P 500 EX S&P 1 ETF GAS-GARCH Student T Volatility Analysis

Volatility prediction for Tuesday, September 29th, 2026

1 Day

12.36%

increased by 0.07%

1 Week

12.43%

increased by 0.14%

1 Month

12.44%

increased by 0.15%

Analysis last updated: Monday, September 28, 2026 at 09:57 PM UTC

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Date Range:

from

to

6M ·

1Y ·

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graph of Ishares S&P 500 EX S&P 1 ETF GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jul 9, 2025 to Sep 25, 2026
𝑓

GAS-GARCH-T Model

Tap to view equation

ParamValuet-stat
ωconst0.6147
7.20***
αARCH0.0398
0.15
βGARCH0.0000
0.00
νDF18.7970
0.01

0.000

Persistence

-

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.6147
7.20***
α

ARCH

Response to squared shocks

0.0398
0.15
β

GARCH

Volatility persistence

0.0000
0.00
ν

DF

Student-t tail thickness

18.7970
0.01

Persistence:

0.000

Half-life:

-