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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 classic literature ?
but it doesn't matter much,' thought Alice, `as all the arches are gone from this side of the ground.
The arches were of white marble, apparently quarried in single, huge blocks from which each arch was cut complete.
Inter first premolar width was measured as transverse distance between the buccal cusp tips of the first permanent premolars in both upper and lower dental arches.