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V-Lab

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

Volatility prediction for Tuesday, August 18th, 2026

1 Day

11.24%

increased by 1.19%

1 Week

11.62%

increased by 1.57%

1 Month

12.78%

increased by 2.73%

Analysis last updated: Monday, August 17, 2026 at 09:44 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 Aug 14, 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

0.0356
15.50***
α

ARCH

Response to squared shocks

0.0105
0.97
β

GARCH

Volatility persistence

0.8501
99.34***
γ

leverage

Additional response to negative shocks

0.2095
13.88***

Persistence:

0.965

Half-life:

20 days