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V-Lab

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

Volatility prediction for Tuesday, July 28th, 2026

1 Day

13.32%

decreased by 0.71%

1 Week

13.52%

decreased by 0.51%

1 Month

14.14%

increased by 0.11%

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 GJR-GARCH

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

This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0354
15.48***
α

ARCH

Response to squared shocks

0.0106
0.98
β

GARCH

Volatility persistence

0.8507
99.87***
γ

leverage

Additional response to negative shocks

0.2082
13.77***

Persistence:

0.965

Half-life:

20 days