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ARCH

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.
References in periodicals archive ?
Damstra considered that a rapid maxillary arch expansion in orthodontic treatment led to change in transversal size of the medioproximal end of the palatal rugae but it did not influence the anterioposterior size.
Treatment options for posterior crossbite correction include maxillary arch expansion, removal of occlusal interferences, and elimination of functional shift.
Maxillary arch expansion provided via tooth or tissue borne appliances is presumed to disarticulate the coronal and sagittal circummaxillary sutures to produce an average of 1.5 to 3mm of maxillary skeletal protraction.8