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	param	t-stat
$ω$	0.0288	36.47
$α$	0.0856	32.41
$β$	0.9065	403.95
$γ$	0.8988	21.98
$δ$	1.0252	40.76

V-Lab

S&P 500 Index APARCH Volatility Analysis

Volatility Prediction for Friday, March 20th, 2026:18.04% (-0.57%)

Date Range:

Parameter Estimates

News Impact Curve

Volatility Forecasts

Other S&P 500 Index Analyses