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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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References in periodicals archive ?
Zygomatic arch deformation; An anatomic and clinical study.
(2008) showed the following three variables contributed considerably to the total discrimination power: the width of first upper molar (La[M.sup.1]), breadth of the upper ramus of the zygomatic process of the maxilla (A) and breadth of the zygomatic arch (B).
HCP is associated with a progressive and painful limitation of the mouth opening, especially in lateral and protrusion movements, which may be restricted due to the contact between the coronoid process and the zygomatic arch [24,25].
A 22G x 1 inch hypodermic needle was inserted perpendicular to the skin in a point located between the caudal margin of the maxilla and the cranial border of the jaw body, ventral to the rostral portion of the zygomatic arch. The needle was advanced into the pterygopalatine fossa until it was considered to be in close proximity to the maxillary nerve and injection of methylene blue dye was then performed.
The transducer is placed distal and parallel to the zygomatic arch to bridge the coronoid and condylar processes.
For example, in the supraorbital keyhole approach, the incision is hidden in the eyebrows, and the bone window reaches the superciliary arch; in the subtemporal keyhole approach, the temporalis is separated and distracted to both sides to avoid the retraction of temporal muscle flap towards the temporal base in the conventional approach, and to prevent the surgical field from being blocked by the zygomatic arch. The keyhole approach gets rid of useless structural damages and tissue exposures to retain the effective operation space to satisfy the actual needs.
Furthermore, 1 cc of 20 mg/ml hyaluronic acid (HA) dermal filler was injected to enhance the left medial and middle cheek fat; 0.5 cc of 20 mg/ml HA was injected for reconstruction of the left zygomatic arch; 0.5 cc of 20 mg/ml HA was used to contour the left nasolabial fold, and 0.2 cc of 20 mg/ml HA was injected to raise the left eyebrow.
A Curvilinear incision was made from zygomatic arch, 1cm in front of tragus, finishing near the midline.
The computed tomography (CT) scan showed two rectangular hyperdense images: one medially to the zygomatic arch and the other one medially to the mandibular ramus (Figure 3).
The visual recordings and photographs taken of the singer's face aided in determining singer success in achieving the required raised or lowered position of the zygomatic arch muscles while performing the exercises.
Myocutaneous flap reflected, five burr holes were made in the following locations: (1) temporal squamous bone just superior to posterior root of zygomatic arch, (2) keyhole area behind frontal end of zygomatic arch anteriorly, (3) 3 cm above transverse sinus and 3 cm lateral to inion, (4) parietal parasaggital and (5) frontal parasagittal area.