V-Lab
China Yangtze Power Co Ltd EGARCH Volatility Analysis
Volatility prediction for Monday, August 17th, 2026
1 Day
21.43%
decreased by 0.55%
1 Week
21.54%
decreased by 0.44%
1 Month
21.96%
decreased by 0.02%
Analysis last updated: Saturday, August 15, 2026 at 06:17 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Nov 18, 2003 to Aug 14, 2026Model Insight
With persistence 0.993, volatility shocks have a half-life of 95 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Inverse leverage: Positive returns increase volatility 48% more than negative returns
σ
EGARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0094 | 9.81*** |
α ARCH Response to squared shocks | 0.1093 | 32.10*** |
β GARCH Volatility persistence | 0.9927 | 1,862.46*** |
γ leverage Additional response to negative shocks | 0.0211 | 6.01*** |
Persistence:
0.993
Half-life:
95 days
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