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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 ?
Where the way was easy they walked hand in hand beneath the arching boughs of the mighty forest, as might in a far-gone past have walked their primeval forbears.
And he saw that he had crawled under the cart and was trying to lift it by arching his back.
A second arrow and a third soared up, missing Broken-Tooth, rustling the leaves as they passed through, arching in their flight and returning to earth.