V-Lab
Chegg Inc GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, August 24th, 2026
1 Day
90.04%
increased by 7.83%
1 Week
89.84%
increased by 7.63%
1 Month
89.08%
increased by 6.87%
Analysis last updated: Friday, August 21, 2026 at 10:33 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 13, 2013 to Aug 21, 2026Model Insight
With persistence 0.993, volatility shocks have a half-life of 105 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 3.43 degrees of freedom, capturing fatter tails than a normal distribution.
𝑓
GAS-GARCH-T Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 21.2347 | 4.04*** |
α ARCH Response to squared shocks | 0.0582 | 50.42*** |
β GARCH Volatility persistence | 0.9934 | 660.97*** |
ν DF Student-t tail thickness | 3.4270 | 28.68*** |
Persistence:
0.993
Half-life:
105 days
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