V-Lab
Manila Electric Co AGARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
33.38%
decreased by 2.81%
1 Week
34.49%
decreased by 1.70%
1 Month
38.32%
increased by 2.13%
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
The news-impact curve is shifted (γ = 0.49) so that negative returns raise next-day volatility more than positive returns of the same size. The gap is largest for small shocks and narrows for larger ones.
σ
AGARCH Model
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Asymmetry: negative returns raise volatility more
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.1563 | 4.03*** |
| αARCH | 0.2015 | 10.21*** |
| βGARCH | 0.7865 | 51.47*** |
| γleverage | 0.4879 | 3.34*** |
0.988
Persistence58d
Half-lifeσ
AGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.1563 | 4.03*** |
α ARCH Response to squared shocks | 0.2015 | 10.21*** |
β GARCH Volatility persistence | 0.7865 | 51.47*** |
γ leverage Additional response to negative shocks | 0.4879 | 3.34*** |
Persistence:
0.988
Half-life:
58 days
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