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	param	t-stat
$ω$	0.0289	36.48
$α$	0.0858	32.41
$β$	0.9063	402.97
$γ$	0.8991	21.98
$δ$	1.0247	40.75

V-Lab

S&P 500 Index APARCH Volatility Analysis

Volatility Prediction for Tuesday, February 17th, 2026:15.32% (-1.05%)

Date Range:

Parameter Estimates

News Impact Curve

Volatility Forecasts

Other S&P 500 Index Analyses