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V-Lab

Diana Tea Co Ltd AGARCH Volatility Analysis

Volatility prediction for Wednesday, July 15th, 2026

1 Day

39.39%

decreased by 1.79%

1 Week

43.07%

increased by 1.89%

1 Month

48.85%

increased by 7.67%

Analysis last updated: Wednesday, July 15, 2026 at 07:18 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

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10Y ·

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graph of Diana Tea Co Ltd AGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Sep 4, 2008 to Jul 10, 2026

Model Insight

The news-impact curve is shifted (γ = -0.29) so that positive returns raise next-day volatility more than negative returns of the same size. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and rare among risky assets.

σ

AGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.5587
24.90***
α

ARCH

Response to squared shocks

0.1764
26.34***
β

GARCH

Volatility persistence

0.6810
69.80***
γ

leverage

Additional response to negative shocks

-0.2911
-3.13***

Persistence:

0.857

Half-life:

5 days