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Related to costal arch: Left Costal Margin

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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.
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Ventral or lateral hernia is commonly seen along the costal arch, high or low in the flank, between last few ribs or in the ventral abdominal wall (Berge and Westhues, 1966).