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	param	t-stat
$ω$	0.7405	6.15
$α$	0.1279	5.71
$β$	0.7534	20.76
$γ_{1}$	-0.0708	-1.09
$γ_{2}$	0.0145	0.15
$γ_{3}$	0.0993	1.18
$γ_{4}$	-0.0396	-0.51

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American Railcar Industries Inc Zero Slope Spline-GARCH Volatility Analysis

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Parameter Estimates

News Impact Curve

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