Welch and Howell Retire

Sequencings and Howell Designs

Grosse and R . Rodney Howell

BACKGROUND: Although newborn screening for critical congenital heart disease (CCHD) was recommended by the US Health and Human Services Secretary’s Advisory Committee on Heritable Disorders in Newborns and Children to promote early detection, it was deemed by the Secretary of the HHS as not ready for adoption pending an implementation plan from HHS agencies. OBJECTIVE: To develop strategies for...

To retire or not to retire, that is the question!

Amerkan Association for the Advancement of Science Science serves its readers as a forum for the presentation and discussion of important issues related to the advancement of science, including the presentation of minority or conflicting points of view, rather than by publishing only material on which a consensus has been reached. Accordingly, all articles published in Science-including editori...

When should surgeons retire?

BACKGROUND Retirement policies for surgeons differ worldwide. A range of normal human functional abilities decline as part of the ageing process. As life expectancy and their population increases, the performance ability of ageing surgeons is now a growing concern in relation to patient care. The aim was to explore the effects of ageing on surgeons' performance, and to identify current practica...

Howell Designs with Sub-designs

A Howell design of side s and order 2n, or more briefly an H(s, 2n), is an s x s array in which each cell is either empty or contains an unordered pair of elements from some (2n)-set V such that (1) every element of V occurs in precisely one cell of each row and each column, and (2) every unordered pair of elements from V is in at most one cell of the array. It follows immediately from the defi...