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V-Lab

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

Volatility prediction for Tuesday, July 28th, 2026

1 Day

868.16%

increased by 52.17%

1 Week

866.11%

increased by 50.12%

1 Month

857.99%

increased by 42.00%

Analysis last updated: Monday, July 27, 2026 at 09:41 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

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

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 24, 2015 to Jul 24, 2026

Model Insight

The estimated Student-t degrees of freedom v = 2.00 sit at the infinite-variance boundary (v → 2): the model is attributing extreme moves to heavy tails rather than to volatility, so the volatility scale is unreliable here. See the boundary-parameters flag.

𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

14.0499
15.30***
α

ARCH

Response to squared shocks

0.0926
131.72***
β

GARCH

Volatility persistence

0.9976
6,196.43***
ν

DF

Student-t tail thickness

2.0001

Persistence:

0.998

Half-life:

292 days