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Autoregressive Conditional Heteroskedasticity

A statistical measure of the average error between a best fit line and actual data that uses past data to predict future performance. General Autoaggressive Conditional Heteroskedasticity is the most common way of doing this. See also: Fractal Distribution.
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The patient was so happy with her new, beautiful smile that she returned a few months later to have the SmileSimplicity procedure performed on her lower arch as well.
and complimentary take-home teeth whitening trays (upper and lower arch trays - value $49) for the first 100 new patients.

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