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
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Sep 4, 2008 to Jul 10, 2026Model 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
| Parameter | Value | t-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
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