V-Lab
Chegg Inc Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, August 24th, 2026
1 Day
125.06%
increased by 37.65%
1 Week
125.88%
increased by 38.47%
1 Month
126.37%
increased by 38.96%
Analysis last updated: Friday, August 21, 2026 at 10:32 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
This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 1 trading day.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.9634 | 5.68*** |
α ARCH Response to squared shocks | 0.4684 | 3.15*** |
β GARCH Volatility persistence | 0.1151 | 1.38 |
Spline Coefficients
K=3
| γ1 | 0.0234 | 0.48 |
| γ2 | 0.0107 | 0.15 |
| γ3 | -0.0711 | -2.36** |
Persistence:
0.583
Half-life:
1 days
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