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	param	t-stat
$ω$	0.9285	7.51
$α$	0.0734	8.87
$β$	0.8802	66.58
$γ_{1}$	0.0282	1.21
$γ_{2}$	-0.0063	-0.18
$γ_{3}$	-0.1049	-4.24
$γ_{4}$	0.1488	6.74
$γ_{5}$	-0.0979	-4.84
$γ_{6}$	0.0753	3.12
$γ_{7}$	-0.0679	-2.49
$γ_{8}$	0.0231	1.03

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AT&T Inc Zero Slope Spline-GARCH Volatility Analysis

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