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	param	t-stat
$ω$	0.0017	3.58
$α$	0.0674	0.04
$β$	0.9182	75.40
$γ$	1.0000	0.03
$δ$	1.4499	11.63

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Calamos S&P 500 STR ALT Sept APARCH Volatility Analysis

Volatility Prediction for Wednesday, February 11th, 2026:2.09% (-0.04%)

Date Range:

Parameter Estimates

News Impact Curve

Volatility Forecasts

Other Calamos S&P 500 STR ALT Sept Analyses