Test of homogeneity of covariances (or homoscedasticity) among several groups has many applications in statistical analysis. In the context of incomplete data analysis, tests of homoscedasticity among groups of cases with identical missing data patterns have been proposed to test whether data are missing completely at random (MCAR). These tests of MCAR require large sample sizes n and/or large ...

Among historians of mathematics Thomas Hawkins has long been regarded as the leading authority on the early history of Lie groups. After decades of work on this fascinating theme, he has synthesized the fruits of his labors in this 564-page Essay in the History of Mathematics, a landmark study that represents the culmination of his contributions to the field. In recognition of these accomplishm...

Carboranes. B9-functionalized carboranylphosphines with bulky electron-donating substituents display an extremely electron-releasing character, as reported by Evamarie Hey-Hawkins et al. in their Research Article (e202218648). The compounds exert a high steric demand, which allows the mesityl derivatives to form stabilized phosphoniumyl radical cations.

Steven Trohalaki, Ruth Pachter, Greg W. Drake, and Tommy Hawkins Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson Air Force Base, OH 45433-7702 Air Force Research Laboratory, Propulsion Directorate, Edwards Air Force Base, CA 93524 The Anteon Corporation, 5100 Springfield Pike, Dayton, OH 45431-1231 [email protected]

In mid-1951 the Bureau of Public Assistance, in cooperation with State public assistance agencies, made a survey to obtain information on the social and medical characteristics of the men and women receiving aid to the permanently and totally disabled. The following article analyzes thefkdings with respect to recipients with a disease of the heart; it is thefirst of several by CHARLES E. HAWKINS *

Claudia Hawkins, Oche Agbaji, Placid Ugoagwu, Chloe L. Thio, Muazu M. Auwal, Charles Ani, Chinedum Okafo, Erika Wallender, and Robert L. Murphy Northwestern University, Chicago, Illinois; Department of Medicine, University of Jos and Jos University Teaching Hospital, HIV Clinic, Jos University Teaching Hospital, Nigeria; Johns Hopkins University, Baltimore, Maryland; and Vanderbilt University M...

The 92nd general meeting was held at the University of Warwick, Coventry, from 3 to 5 April 1974. Abstracts of the scientific communications follow. The Guest Lecture was given by Dr C. F. Hawkins on 'Speaking at meetings'. Two symposia were held, one on 'Systemic manifestations of intravascular coagulation' (Chairman: Professor E. K. Blackburn), and the other on 'Jaundice' (Chairman: Professor...

1Department of Neurosurgery, University of Iowa Hospital and Clinics, 200 Hawkins Drive, Iowa City, IA 52242, USA 2Department of Neurological Surgery, Thomas Jefferson University and Jefferson Hospital for Neuroscience, 3rd Floor, 901 Walnut Street, Philadelphia, PA 19107, USA 3Department of Neurosurgery, University of Virginia, Charlottesville, VA 22908, USA 4Department of Neurosurgery, Yale U...