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
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 25, 2017 to Sep 18, 2026Model 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
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Shock decay: Shocks decay with a 5-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 2.4149 | 3.48*** |
| αARCH | 0.1901 | 3.07*** |
| βGARCH | 0.7202 | 13.22*** |
| γleverage | -0.0815 | -0.85 |
0.870
Persistence5d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-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
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