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	param	t-stat
$ω$	0.0731	13.37
$α$	0.1007	8.66
$β$	0.8676	70.89
$γ$	1.0000	7.74
$δ$	0.9734	10.68

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SPDR S&P 500 Buyback ETF APARCH Volatility Analysis

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Parameter Estimates

News Impact Curve

Volatility Forecasts

Other SPDR S&P 500 Buyback ETF Analyses