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	param	t-stat
$ω$	1.7866	8.78
$α$	0.0930	2.74
$β$	0.4738	3.66
$γ_{1}$	0.4615	3.96
$γ_{2}$	-0.5517	-3.58

V-Lab

Portillo'S Inc Zero Slope Spline-GARCH Volatility Analysis

Volatility Prediction for Tuesday, February 17th, 2026:56.78% (-4.30%)

Date Range:

Parameter Estimates

News Impact Curve

Volatility Forecasts

Other Portillo'S Inc Analyses