V-Lab
Wawel Sa Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, July 27th, 2026
1 Day
24.44%
increased by 3.01%
1 Week
25.75%
increased by 4.32%
1 Month
27.06%
increased by 5.63%
Analysis last updated: Sunday, July 26, 2026 at 04:47 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 30, 1998 to Jul 24, 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 2 trading days.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 2.1359 | 6.32*** |
α ARCH Response to squared shocks | 0.2397 | 9.03*** |
β GARCH Volatility persistence | 0.5044 | 10.22*** |
Spline Coefficients
K=10
| γ1 | 0.0313 | 0.42 |
| γ2 | -0.0093 | -0.09 |
| γ3 | 0.0708 | 0.94 |
| γ4 | -0.2742 | -3.81*** |
| γ5 | 0.3516 | 5.01*** |
| γ6 | -0.2642 | -3.74*** |
| γ7 | 0.1225 | 1.59 |
| γ8 | -0.0553 | -0.63 |
| γ9 | 0.0913 | 1.16 |
| γ10 | -0.0988 | -1.96* |
Persistence:
0.744
Half-life:
2 days
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