ARCH

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Related to hyoid arch: primary palate

ARCH

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 periodicals archive ?
7] M RA show deletions of one pair of ceratobrachials, whereas the ceratohyals in the hyoid arch and, in many cases, Meckel's cartilage in the mandibular arch remain.
the ossification of the ligament connecting the suspensorium to the ethmoid region (190: 0 [right arrow] 1) and the interhyal (ossified or not) being connected by ligaments to both the hyoid arch and the suspensorium (225: 0 [right arrow] 1) (see Appendix 2).
The two structures of primary importance in the transition from agnathan (jawless) fish to gnathostomes were the mandibular arch (gill arch 2) and the hyoid arch (gill arch 3).