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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 ?
The literature reports many different types of appliances that can be used as fixed space maintainers including Band and loop appliance, crown and loop appliance, distal shoe appliance, Transpalatal arch, Nance palatal arch appliance, Lingual arch and Fixed wire composite space maintainers.
If the child is missing the first primary molar, in addition to the second primary molar, a lingual arch appliance may be placed but only after all four incisors have erupted.
He recommended a passive lingual arch when the leeway space was equal to or greater than the degree of anterior crowding.