V-Lab
Chegg Inc GAS-GARCH Student T Volatility Analysis
Volatility prediction for Monday, July 27th, 2026
1 Day
110.64%
decreased by 6.41%
1 Week
110.25%
decreased by 6.80%
1 Month
108.73%
decreased by 8.32%
Analysis last updated: Friday, July 24, 2026 at 10:25 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 13, 2013 to Jul 24, 2026Model Insight
With persistence 0.994, volatility shocks have a half-life of 107 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 | 21.7136 | 4.10*** |
α ARCH Response to squared shocks | 0.0590 | 50.72*** |
β GARCH Volatility persistence | 0.9936 | 689.97*** |
ν DF Student-t tail thickness | 3.4301 | 29.33*** |
Persistence:
0.994
Half-life:
107 days
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