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	param	t-stat
$ω$	0.9428	6.96
$α$	0.0373	4.26
$β$	0.9241	57.41
$γ_{1}$	-0.0394	-0.69
$γ_{2}$	0.1057	1.21
$γ_{3}$	-0.1401	-2.65
$γ_{4}$	0.0663	1.55
$γ_{5}$	0.0880	2.12
$γ_{6}$	-0.1557	-3.43
$γ_{7}$	0.1247	2.79
$γ_{8}$	-0.0704	-1.38
$γ_{9}$	0.0232	0.51

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HP Inc Zero Slope Spline-GARCH Volatility Analysis

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