V-Lab
Chegg Inc Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, October 5th, 2026
1 Day
96.49%
increased by 6.04%
1 Week
113.71%
increased by 23.26%
1 Month
122.93%
increased by 32.48%
Analysis last updated: Friday, October 2, 2026 at 11:25 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 13, 2013 to Oct 2, 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
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.9670 | 5.69*** |
| αARCH | 0.4695 | 3.15*** |
| βGARCH | 0.1137 | 1.38 |
Spline Coefficients
K=3
| γ1 | 0.0262 | 0.55 |
| γ2 | 0.0048 | 0.07 |
| γ3 | -0.0662 | -2.23** |
0.583
Persistence1d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.9670 | 5.69*** |
α ARCH Response to squared shocks | 0.4695 | 3.15*** |
β GARCH Volatility persistence | 0.1137 | 1.38 |
Spline Coefficients
K=3
| γ1 | 0.0262 | 0.55 |
| γ2 | 0.0048 | 0.07 |
| γ3 | -0.0662 | -2.23** |
Persistence:
0.583
Half-life:
1 days
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