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

Volatility prediction for Tuesday, September 8th, 2026

1 Day

1,195.84%

increased by 40.22%

1 Week

1,193.03%

increased by 37.41%

1 Month

1,181.91%

increased by 26.29%

Analysis last updated: Saturday, September 5, 2026 at 02:27 AM 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 Sep 4, 2026
Extended Optimization

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

Unreliable tails: v = 2.00 sits at the infinite-variance boundary
ParamValuet-stat
ωconst17.4131
3.83***
αARCH0.0923
32.97***
βGARCH0.9976
1,563.70***
νDF2.0001

0.998

Persistence

294d

Half-life
𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

17.4131
3.83***
α

ARCH

Response to squared shocks

0.0923
32.97***
β

GARCH

Volatility persistence

0.9976
1,563.70***
ν

DF

Student-t tail thickness

2.0001

Persistence:

0.998

Half-life:

294 days