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	param	t-stat
$ω$	0.2026	5.23
$α$	0.1757	17.56
$β$	0.7755	52.07
$γ$	-0.0104	-0.27
$δ$	0.5000	8.70

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Tetraphase Pharmaceuticals Inc APARCH Volatility Analysis

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Parameter Estimates

News Impact Curve

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