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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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There were 13 pairs of ribs; the first seven pairs were sternal (costae verae) and the remaining six pairs were asternal (costae spuriae) of which the last 2-3 pairs were floating ribs (costae fluctuantes) having no distinct attachment to the costal arch. There was a distinct costal groove on the external faces of the shafts of the 3rd, 4th, and 5th ribs.
Ventral hernia is commonly seen along the costal arch, high or low in flank, between last few ribs or in ventral abdominal wall near the mid line (Sankar et al, 2010).
Abdominal hernia can occur high or low in flank, along the costal arch or between the last few ribs (Keown, 1974).