V-Lab
Boeing Co/The Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Friday, September 4th, 2026
1 Day
28.11%
decreased by 0.52%
1 Week
28.87%
increased by 0.24%
1 Month
30.89%
increased by 2.26%
Analysis last updated: Thursday, September 3, 2026 at 09:40 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Aug 28, 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 12 trading days.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0359 | 7.69*** |
α ARCH Response to squared shocks | 0.0759 | 7.25*** |
β GARCH Volatility persistence | 0.8690 | 51.18*** |
Spline Coefficients
K=10
| γ1 | 0.0191 | 0.45 |
| γ2 | 0.0506 | 0.72 |
| γ3 | -0.1482 | -2.55** |
| γ4 | 0.0660 | 1.23 |
| γ5 | 0.0931 | 2.22** |
| γ6 | -0.1750 | -4.67*** |
| γ7 | 0.1619 | 3.67*** |
| γ8 | -0.0467 | -0.90 |
| γ9 | -0.0766 | -1.55 |
| γ10 | 0.0724 | 2.28** |
Persistence:
0.945
Half-life:
12 days
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