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	param	t-stat
$ω$	0.0455	21.63
$α$	0.0878	27.38
$β$	0.9122	295.41
$γ$	0.3870	14.41
$δ$	0.7990	19.19

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Varian Medical Systems Inc APARCH Volatility Analysis

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Parameter Estimates

News Impact Curve

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