V-Lab
Manila Electric Co Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
31.15%
decreased by 3.14%
1 Week
32.00%
decreased by 2.29%
1 Month
33.90%
decreased by 0.39%
Analysis last updated: Friday, September 11, 2026 at 09:04 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 7, 1995 to Sep 4, 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 8 trading days.
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 | 0.7533 | 3.00*** |
| αARCH | 0.2393 | 5.36*** |
| βGARCH | 0.6734 | 16.06*** |
Spline Coefficients
K=8
| γ1 | 0.0060 | 0.09 |
| γ2 | -0.0545 | -0.58 |
| γ3 | 0.1080 | 1.86* |
| γ4 | -0.1531 | -3.53*** |
| γ5 | 0.1385 | 3.41*** |
| γ6 | -0.0074 | -0.19 |
| γ7 | -0.0694 | -1.96** |
| γ8 | 0.0371 | 1.52 |
0.913
Persistence8d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.7533 | 3.00*** |
α ARCH Response to squared shocks | 0.2393 | 5.36*** |
β GARCH Volatility persistence | 0.6734 | 16.06*** |
Spline Coefficients
K=8
| γ1 | 0.0060 | 0.09 |
| γ2 | -0.0545 | -0.58 |
| γ3 | 0.1080 | 1.86* |
| γ4 | -0.1531 | -3.53*** |
| γ5 | 0.1385 | 3.41*** |
| γ6 | -0.0074 | -0.19 |
| γ7 | -0.0694 | -1.96** |
| γ8 | 0.0371 | 1.52 |
Persistence:
0.913
Half-life:
8 days
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