V-Lab
Obayashi Corp Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Monday, August 17th, 2026
1 Day
28.00%
decreased by 1.39%
1 Week
29.41%
increased by 0.02%
1 Month
32.36%
increased by 2.97%
Analysis last updated: Saturday, August 15, 2026 at 10:33 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 3, 1990 to Aug 14, 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 7 trading days.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0855 | 7.14*** |
α ARCH Response to squared shocks | 0.1411 | 9.48*** |
β GARCH Volatility persistence | 0.7651 | 38.05*** |
Spline Coefficients
K=9
| γ1 | -0.0119 | -0.34 |
| γ2 | 0.0790 | 1.60 |
| γ3 | -0.1652 | -5.73*** |
| γ4 | 0.1737 | 6.21*** |
| γ5 | -0.1266 | -4.17*** |
| γ6 | 0.0754 | 2.51** |
| γ7 | -0.0357 | -1.18 |
| γ8 | 0.0378 | 1.19 |
| γ9 | -0.0433 | -1.66* |
Persistence:
0.906
Half-life:
7 days
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