V-Lab
S&P GSCI All Cattle Spot Index APARCH Volatility Analysis
Volatility prediction for Wednesday, September 9th, 2026
1 Day
17.16%
1 Week
17.14%
1 Month
17.06%
Analysis last updated: Tuesday, September 8, 2026 at 11:30 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 7, 2002 to Sep 8, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 374% more than equivalent positive returns. The volatility power δ = 1.42 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
APARCH Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0130 | 6.17*** |
| αARCH | 0.0420 | 6.36*** |
| βGARCH | 0.9493 | 157.99*** |
| γleverage | 0.4987 | 4.38*** |
| δpower | 1.4214 | 7.13*** |
0.987
Persistence55d
Half-lifeAPARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0130 | 6.17*** |
α ARCH Response to squared shocks | 0.0420 | 6.36*** |
β GARCH Volatility persistence | 0.9493 | 157.99*** |
γ leverage Additional response to negative shocks | 0.4987 | 4.38*** |
δ power Transformation power | 1.4214 | 7.13*** |
Persistence:
0.987
Half-life:
55 days
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