V-Lab
Cargills Ceylon PLC GJR-GARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
26.90%
decreased by 0.36%
1 Week
27.04%
decreased by 0.22%
1 Month
27.58%
increased by 0.32%
Analysis last updated: Sunday, September 20, 2026 at 01:33 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 31, 1994 to Sep 18, 2026Model Insight
With persistence 0.991, volatility shocks have a half-life of 75 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
σ
GJR-GARCH Model
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High persistence: persistence 0.991, shock half-life ~75 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0418 | 2.71*** |
| αARCH | 0.0411 | 2.15** |
| βGARCH | 0.9518 | 86.69*** |
| γleverage | -0.0040 | -0.15 |
0.991
Persistence75d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0418 | 2.71*** |
α ARCH Response to squared shocks | 0.0411 | 2.15** |
β GARCH Volatility persistence | 0.9518 | 86.69*** |
γ leverage Additional response to negative shocks | -0.0040 | -0.15 |
Persistence:
0.991
Half-life:
75 days
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