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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 Roman layer, which is the most ancient and deepest, is occupied by the round arch, which reappears, supported by the Greek column, in the modern and upper layer of the Renaissance.
There are four sister and parallel architectures, each having its special character, but derived from the same origin, the round arch.
Dorothy knew it at once because it had over its great door the carved head of a fox just like the one she had seen on the arch, and this fox was the only one who wore a golden crown.
Dorothy knew the King at once, because she had seen his head carved on the arch and over the doorway of the palace.
And so I turned and passed beneath the great arch into the city of London.
As I craned my neck to catch a glimpse of the thing that had aroused the fury of the beast before me, it sprang through the arched gateway and was at my side--with parted lips and heaving bosom and disheveled hair--a bronzed and lovely vision to eyes that had never harbored hope of rescue.
Through the red mist that floated all around her, she could see high walls of changing light, where orange, blue, and violet flames went flickering to and fro, making graceful figures as they danced and glowed; and underneath these rainbow arches, little Spirits glided, far and near, wearing crowns of fire, beneath which flashed their wild, bright eyes; and as they spoke, sparks dropped quickly from their lips, and Ripple saw with wonder, through their garments of transparent light, that in each Fairy's breast there burned a steady flame, that never wavered or went out.
Come out with us," the Spirits said, "and see the bright path we have made for you." So they led her to the lofty gate, and here, from sky to earth, a lovely rainbow arched its radiant colors in the sun.
Clifford could hear the obstreperous howl of the steam-devil, and, by leaning a little way from the arched window, could catch a glimpse of the trains of cars, flashing a brief transit across the extremity of the street.
One afternoon a scissor-grinder chanced to set his wheel a-going under the Pyncheon Elm, and just in front of the arched window.
The wind itself had ceased and a brilliant, deep blue sky arched high over the moorland.
Toward this U-Dor led his prisoners and their guard to the great arched entrance before which a line of fifty mounted warriors barred the way.