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Invesco S&P 500 Quality ETF GAS-GARCH Student T Volatility Analysis

Volatility prediction for Wednesday, September 9th, 2026

1 Day

10.16%

decreased by 0.42%

1 Week

10.48%

decreased by 0.10%

1 Month

11.58%

increased by 1.00%

Analysis last updated: Tuesday, September 8, 2026 at 10:43 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Invesco S&P 500 Quality ETF GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Dec 6, 2005 to Sep 4, 2026

Model Insight

Volatility shocks decay with a half-life of 54 trading days, meaning a shock loses half its impact after approximately 54 days. Returns follow a Student-t distribution with v = 7.56 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

Shock decay: Shocks decay with a 54-day half-lifev = 7.56 · fat tails
ParamValuet-stat
ωconst1.4632
1.44
αARCH0.1109
8.53***
βGARCH0.9874
104.03***
νDF7.5598
1.65*

0.987

Persistence

54d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.4632
1.44
α

ARCH

Response to squared shocks

0.1109
8.53***
β

GARCH

Volatility persistence

0.9874
104.03***
ν

DF

Student-t tail thickness

7.5598
1.65*

Persistence:

0.987

Half-life:

54 days