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V-Lab

China Yangtze Power Co Ltd GAS-GARCH Student T Volatility Analysis

Volatility prediction for Tuesday, August 25th, 2026

1 Day

20.29%

decreased by 0.42%

1 Week

20.37%

decreased by 0.34%

1 Month

20.67%

decreased by 0.04%

Analysis last updated: Tuesday, August 25, 2026 at 06:05 PM UTC

Date Range:

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to

6M ·

1Y ·

2Y ·

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10Y ·

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graph of China Yangtze Power Co Ltd GAS-GARCH-T

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 18, 2003 to Aug 21, 2026

Model Insight

With persistence 0.995, volatility shocks have a half-life of 146 trading days (~0.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate. Returns follow a Student-t distribution with v = 4.86 degrees of freedom, capturing fatter tails than a normal distribution.

𝑓

GAS-GARCH-T Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

2.9657
4.80***
α

ARCH

Response to squared shocks

0.0547
50.37***
β

GARCH

Volatility persistence

0.9953
1,132.26***
ν

DF

Student-t tail thickness

4.8597
14.41***

Persistence:

0.995

Half-life:

146 days