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	param	t-stat
$ω$	0.0246	27.56
$α$	0.0811	35.04
$β$	0.9189	403.93
$γ$	0.2207	10.01
$δ$	0.8591	27.11

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Piedmont Natural Gas Co Inc APARCH Volatility Analysis

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Parameter Estimates

News Impact Curve

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