S&P GSCI Nickel Spot Index APARCH Volatility Analysis
Volatility prediction for Monday, October 19th, 2026
1 Day
19.81%
increased by 0.02%
1 Week
20.16%
increased by 0.37%
1 Month
21.40%
increased by 1.61%
Analysis last updated: Friday, October 16, 2026 at 11:53 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 8, 1993 to Oct 16, 2026Model Insight
With persistence 0.990, volatility shocks have a half-life of 71 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
σ
APARCH Model
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High persistence: persistence 0.990, shock half-life ~71 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0444 | 3.61*** |
| αARCH | 0.0451 | 4.73*** |
| βGARCH | 0.9437 | 109.38*** |
| γleverage | -0.0983 | -1.67* |
| δpower | 2.0588 | 7.98*** |
0.990
Persistence71d
Half-lifeσ
APARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0444 | 3.61*** |
α ARCH Response to squared shocks | 0.0451 | 4.73*** |
β GARCH Volatility persistence | 0.9437 | 109.38*** |
γ leverage Additional response to negative shocks | -0.0983 | -1.67* |
δ power Transformation power | 2.0588 | 7.98*** |
Persistence:
0.990
Half-life:
71 days
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