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V-Lab

CarMax Inc GJR-GARCH Volatility Analysis

Volatility prediction for Monday, July 27th, 2026

1 Day

48.38%

decreased by 0.74%

1 Week

48.49%

decreased by 0.63%

1 Month

48.89%

decreased by 0.23%

Analysis last updated: Friday, July 24, 2026 at 10:40 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of CarMax Inc GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Feb 4, 1997 to Jul 24, 2026

Model Insight

With persistence 0.993, volatility shocks have a half-life of 105 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Leverage: Negative returns increase volatility 169% more than positive returns

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0815
10.33***
α

ARCH

Response to squared shocks

0.0174
6.06***
β

GARCH

Volatility persistence

0.9614
416.92***
γ

leverage

Additional response to negative shocks

0.0293
5.25***

Persistence:

0.993

Half-life:

105 days