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V-Lab

Phihong Technology GJR-GARCH Volatility Analysis

Volatility prediction for Monday, July 27th, 2026

1 Day

48.62%

decreased by 1.06%

1 Week

48.26%

decreased by 1.42%

1 Month

47.23%

decreased by 2.45%

Analysis last updated: Sunday, July 26, 2026 at 05:39 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Phihong Technology GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 21, 2001 to Jul 24, 2026

Model Insight

Volatility shocks decay with a half-life of 12 trading days, meaning a shock loses half its impact after approximately 12 days.

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.4455
16.63***
α

ARCH

Response to squared shocks

0.0864
16.60***
β

GARCH

Volatility persistence

0.8577
174.72***
γ

leverage

Additional response to negative shocks

0.0012
0.14

Persistence:

0.945

Half-life:

12 days