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	param	t-stat
$ω$	0.0811	18.23
$α$	0.1058	33.43
$β$	0.8832	272.09
$γ$	0.4690	20.61
$δ$	1.0499	30.73

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Aetna Inc APARCH Volatility Analysis

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News Impact Curve

Volatility Forecast

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