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V-Lab

Exponent Inc GJR-GARCH Volatility Analysis

Volatility prediction for Wednesday, August 26th, 2026

1 Day

29.83%

decreased by 0.23%

1 Week

30.12%

increased by 0.06%

1 Month

31.20%

increased by 1.14%

Analysis last updated: Tuesday, August 25, 2026 at 09:23 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Exponent Inc GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Aug 17, 1990 to Aug 21, 2026

Model Insight

With persistence 0.996, volatility shocks have a half-life of 164 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Leverage: Negative returns increase volatility 327% more than positive returns

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0489
8.17***
α

ARCH

Response to squared shocks

0.0152
10.52***
β

GARCH

Volatility persistence

0.9556
549.53***
γ

leverage

Additional response to negative shocks

0.0498
13.72***

Persistence:

0.996

Half-life:

164 days