Anomalies persist in the foundations of ridge regression as set forth in Hoerl and Kennard (1970) and subsequently. Conventional ridge estimators and their properties do not follow on constraining lengths of solution vectors using LaGrange’s method, as claimed. Estimators so constrained have singular distributions; the proposed solutions are not necessarily minimizing; and heretofore undiscover...

The astronomical site parameters for the Magdalena Ridge Observatory (MRO) are being studied from numerous aspects including meteorological, environmental, seismic and sky quality (e.g. “seeing”, cloud cover). Results to date indicate that MRO is an excellent site for astronomical observing. Seeing measurements of less that 1 arc second in the optical are routinely obtained. Seismic conditions ...

Alveolar ridge bone resorption is a biologic phenomenon that occurs following tooth extraction and cannot be prevented. This paper reviews the vertical and horizontal ridge dimensional changes that are associated with tooth extraction. It also provides an overview of the advantages of ridge preservation as well as grafting materials. A Medline search among English language papers was performed ...

The Foundation hotspot–Pacific-Antarctic Ridge (PAR) system is the best documented case of a fast spreading ridge approaching a hotspot and interacting with it. The morphology, crustal structure inferred from gravity anomalies and the chemical composition of the lavas of the axial area of the PAR show evidence of the influence of the hotspot, that is presently located roughly 35 km west of the ...

Mandibular Block Autografts for Alveolar Ridge Augmentation Michael A. Pikos, DDS Coastal Jaw Surgery, 2711 Tampa Road, Palm Harbor, FL 34684, USA Division of Oral and Maxillofacial Surgery, Department of Surgery, The University of Miami, 1611 N.W. 12th Avenue, Miami, FL 33136, USA Ohio State University, 305 West 12th Avenue, Columbus, OH 43218-2357, USA College of Dental Medicine, Nova Southea...

INTRODUCTION Vertical augmentation of the alveolar ridge is necessary for extensive resorption of the alveolar ridge. AIM To evaluate treatment outcome after alveolar ridge augmentation by a sandwich osteotomy combined with an interpositional allograft. PATIENTS AND METHODS The deficient alveolar ridges were augmented by a sandwich osteotomy combined with bovine collagen matrix as an interp...

Ridge splitting and ridge expansion have been used to expand narrow alveolar ridges. Piezosurgical ridge splitting involves separating the atrophic crests with piezosurgical inserts. Ridge expansion with motor-driven expanders was proposed to achieve the cortical dilation. The purpose of this study was to evaluate the efficacy of ridge gain by ridge expansion or ridge splitting. Eighteen (36 ra...

This study is about the development of a robust ridge regression estimator. It is based on weighted ridge MM-estimator (WRMM) and is believed to have potentials in remedying the problems of multicollinearity. The proposed method has been compared with several existing estimators, namely ordinary least squares (OLS), robust regression based on MM estimator, ridge regression (RIDGE), weighted rid...