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V-Lab

HP Inc GJR-GARCH Volatility Analysis

Volatility prediction for Monday, July 27th, 2026

1 Day

43.19%

increased by 0.82%

1 Week

43.10%

increased by 0.73%

1 Month

42.75%

increased by 0.38%

Analysis last updated: Friday, July 24, 2026 at 10:37 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of HP Inc GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Jul 24, 2026

Model Insight

With persistence 0.990, volatility shocks have a half-life of 69 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Leverage: Negative returns increase volatility 82% more than positive returns

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0579
12.23***
α

ARCH

Response to squared shocks

0.0204
12.21***
β

GARCH

Volatility persistence

0.9613
482.33***
γ

leverage

Additional response to negative shocks

0.0166
6.06***

Persistence:

0.990

Half-life:

69 days