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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.
References in classic literature ?
The high, deep, blue sky arched over Misselthwaite as well as over the moor, and she kept lifting her face and looking up into it, trying to imagine what it would be like to lie down on one of the little snow-white clouds and float about.
The low arched door then opened, and the face came out.
The access, as usual in castles of the period, lay through an arched barbican, or outwork, which was terminated and defended by a small turret at each corner.
There were similar pillars on the opposite side, but between them, instead of windows, were arched niches in which stood life-size plaster statues, chipped, broken, and defaced in an extraordinary fashion.