V-Lab
Chegg Inc APARCH Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
92.34%
1 Week
93.03%
1 Month
94.67%
Analysis last updated: Friday, September 11, 2026 at 11:52 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 13, 2013 to Sep 11, 2026Model Insight
Volatility shocks decay with a half-life of 8 trading days, meaning a shock loses half its impact after approximately 8 days. The volatility power δ = 0.66 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
APARCH Model
Tap to view equation
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.2875 | 1.87* |
| αARCH | 0.2111 | 3.51*** |
| βGARCH | 0.7439 | 10.44*** |
| γleverage | -0.1227 | -0.56 |
| δpower | 0.6619 | 2.27** |
0.913
Persistence8d
Half-lifeAPARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.2875 | 1.87* |
α ARCH Response to squared shocks | 0.2111 | 3.51*** |
β GARCH Volatility persistence | 0.7439 | 10.44*** |
γ leverage Additional response to negative shocks | -0.1227 | -0.56 |
δ power Transformation power | 0.6619 | 2.27** |
Persistence:
0.913
Half-life:
8 days
Other APARCH Analyses on Equities