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	param	t-stat
$ω$	1.3604	7.70
$α$	0.1020	10.19
$β$	0.8662	74.15
$γ_{1}$	0.0877	6.46
$γ_{2}$	-0.1389	-6.31
$γ_{3}$	0.0799	4.95
$γ_{4}$	-0.0515	-3.52
$γ_{5}$	0.0452	2.71
$γ_{6}$	-0.0324	-2.52

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S&P 500 Index Zero Slope Spline-GARCH Volatility Analysis

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