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V-Lab

Proshares S&P 500 EX-Technology ETF GARCH Volatility Analysis

Volatility prediction for Wednesday, August 12th, 2026

1 Day

12.18%

decreased by 0.36%

1 Week

12.33%

decreased by 0.21%

1 Month

12.76%

increased by 0.22%

Analysis last updated: Tuesday, August 11, 2026 at 10:14 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Proshares S&P 500 EX-Technology ETF GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 24, 2015 to Aug 7, 2026

Model Insight

Volatility shocks decay with a half-life of 17 trading days, meaning a shock loses half its impact after approximately 17 days.

σ

GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0303
12.89***
α

ARCH

Response to squared shocks

0.0928
16.06***
β

GARCH

Volatility persistence

0.8681
112.51***

Persistence:

0.961

Half-life:

17 days