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V-Lab

Invesco S&P 500 Quality ETF Zero Slope Spline-GARCH Volatility Analysis

Volatility prediction for Monday, August 17th, 2026

1 Day

14.54%

decreased by 0.92%

1 Week

14.85%

decreased by 0.61%

1 Month

15.81%

increased by 0.35%

Analysis last updated: Friday, August 14, 2026 at 10:41 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Invesco S&P 500 Quality ETF S0GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Dec 6, 2005 to Aug 14, 2026

Model Insight

This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 19 trading days.

τ

Zero Slope Spline-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.3365
7.03***
α

ARCH

Response to squared shocks

0.1356
8.88***
β

GARCH

Volatility persistence

0.8293
48.36***
γi Spline Coefficients
K=3
γ1-0.0063
-0.61
γ20.0243
1.51
γ3-0.0254
-2.76***

Persistence:

0.965

Half-life:

19 days