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V-Lab
V-Lab

Appian Corp GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 22nd, 2026

1 Day

62.06%

decreased by 0.77%

1 Week

63.54%

increased by 0.71%

1 Month

66.21%

increased by 3.38%

Analysis last updated: Monday, September 21, 2026 at 09:19 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

All

graph of Appian Corp GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 25, 2017 to Sep 18, 2026

Model Insight

Volatility shocks decay with a half-life of 5 trading days, meaning a shock loses half its impact after approximately 5 days.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 5-day half-life
ParamValuet-stat
ωconst2.4149
3.48***
αARCH0.1901
3.07***
βGARCH0.7202
13.22***
γleverage-0.0815
-0.85

0.870

Persistence

5d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

2.4149
3.48***
α

ARCH

Response to squared shocks

0.1901
3.07***
β

GARCH

Volatility persistence

0.7202
13.22***
γ

leverage

Additional response to negative shocks

-0.0815
-0.85

Persistence:

0.870

Half-life:

5 days