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V-Lab

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

Volatility prediction for Tuesday, September 8th, 2026

1 Day

12.14%

increased by 0.64%

1 Week

12.44%

increased by 0.94%

1 Month

13.34%

increased by 1.84%

Analysis last updated: Saturday, September 5, 2026 at 02:26 AM 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 Sep 4, 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

Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
ωconst0.0353
3.86***
αARCH0.0104
0.24
βGARCH0.8509
24.95***
γleverage0.2077
3.46***

0.965

Persistence

20d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0353
3.86***
α

ARCH

Response to squared shocks

0.0104
0.24
β

GARCH

Volatility persistence

0.8509
24.95***
γ

leverage

Additional response to negative shocks

0.2077
3.46***

Persistence:

0.965

Half-life:

20 days