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Related to archest: Arches National Park

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 ?
It is the guise, and a guile, that stands simultaneously for guiselessness and all disguises, for guile of the archest sort and for perfect innocence.
This was Red Sox-Yankees, and even though it is only April, the teams remain the archest of rivals and one run might mean an awful lot come September.
Arguably the archest suggestion on the show came from Cameron Diaz, who thinks that turning the shower water off while shaving one's legs would do wonders for the environment.