D‐optimal minimax fractional factorial designs

The D‐optimal minimax criterion is proposed to construct fractional factorial designs. The resulting designs are very efficient, and robust against misspecification of the effects in the linear model. The criterion was first proposed by Wilmut & Zhou (2011); their work is limited to two‐level factorial designs, however. In this paper we extend this criterion to designs with factors having any levels (including mixed levels) and explore several important properties of this criterion. Theoretical results are obtained for construction of fractional factorial designs in general. This minimax criterion is not only scale invariant, but also invariant under level permutations. Moreover, it can be applied to any run size. This is an advantage over some other existing criteria. The Canadian Journal of Statistics 41: 325–340; 2013 © 2013 Statistical Society of Canada     

Models of illegitimacy: United States, 1969

Three theoretical perspectives on illegitimacy, the anomic, the subgroup, and the demographic, are reviewed and compared. A composite causal model is then developed and estimated using areal data derived from the 1970 U.S. Census. While theoretical nonspecificity disallowed a definitive test, all three perspectives yielded valuable insight into the complex mechanisms underlying illegitimacy rates. Results indicate that variation in illegitimacy rates is systematically related to variation in social structure and that integration of the three positions should prove useful to further research.     

Safety First: A Model of Care for Working Systemically With High Risk Young People and Their Families in an Acute CAMHS Service

The following article outlines the Safety First Model for working with high‐risk young people in crisis. This hierarchical model prioritises emotional and physical safety by using multi‐systemic and family‐based interventions. A typical case example is used to illustrate the model and the structures and strategies employed at each level. The intervention model empowers families, facilitates their connections with other providers, and minimises the need for hospital admissions. The model also promotes collaborative and systemic practice in a child and adolescent mental health service.     

Volunteering in a voluntary community: Kibbutz members and voluntarism

The way in which kibbutz members define voluntarism, their attitudes toward it, the volunteering they do, their reasons for doing it, and the helping mechanisms and obstacles that the kibbutz offers were explored in a sample of four Israeli kibbutzim. This is a preliminary study of the way a unique society deals with a well-known field. Between-kibbutz differences were found mainly between the religious kibbutz and the others. No satisfactory explanations for between-person differences with regard to volunteering could be found, and it is hypothesised that the difference may lie in orientation to traditional kibbutz ideology. Our grateful thanks are given to Benjamin Gidron and our anonymous reviewers for their helpful comments. We also acknowledge the contribution of Nahum Goldshneider, Varda Rappaport, Yigal Nachtomi, Yishai Koom, Yoram Margai, Shoshana Cohen and Avi Ofir who participated in the data collection and provided welcome input to the research process.     

Aspects physiques de la division sexuelle des tâches: quand la qualification professionnelle et l'organisation du travail viennent en aide aux femmes cols bleus*

The greatest hindrances to women's persistence in non-traditional jobs in industry are psychosocial and organizational; physical difficulties seem negligible in comparison. This study identifies the physical characteristics of three categories of manual jobs and shows how they affect the way women perform their work and their physical (and mental) health. On the basis of data collected on men and women's bodily pains, physical difficulties, and psychosocial problems, the study suggests that to a certain extent, women have succeeded qualitatively and quantitatively in entering these jobs, although problems—health risks, adaptation of tools and machinery, and the “cultural coexistence” of the sexes—remain to be resolved in the short term. The study finally suggests that women could take advantage of both organization in the workplace and their own technical qualifications to guarantee their legitimacy in such jobs. Les principaux obstacles au maintien des femmes en emploi non tra-ditionnel en industrie sont de nature psycho-sociale ou organisation-nelle. Les difficultés d'ordre physique paraissent négligeables en comparaison. Cette étude dresse la liste des caractéristiques physiques de trois catégories d'emplois manuels et montre comment celles-ci affectent la facilité avec laquelle les femmes les occupent et leur intégrité physique (et mentale). Sur la base d'un relevé des douleurs, difficultés physiques et problèmes psycho-sociaux des femmes et des homines, l'étude suggère un succès relatif, quantitatif et qualitatif, de rintégration des femmes dans ce milieu de travail, mais encore des problemes (de santé, d'aménagement matériel, de «co-existence culturelle» des sexes) qui à moyen terme devront être résolus, et que les femmes peuvent tirer parti de l'organisation du travail et de leur qualification technique pour assurer leur légitimité dans ces emplois.     

The prevalence of surgical sterilization in a suburban population

This report presents data on the prevalence of tubal ligations, vasectomies and remedial sterilizing operations among white couples, with wife aged 20–54, who subscribe to a pre-paid medical care program and live in a suburban area near San Francisco. Contraceptive operations, more than two-thirds of which were male vasectomies, were found among 23 per cent of these couples. Some form of sterilizing surgery (contraceptive or remedial) was found among 31 per cent. The prevalence of surgical sterilization, specifically vasectomies, in this population is high compared with that found across the nation or in the Western states in the 1965 National Fertility Study. Variations in the prevalence of tubal ligations and vasectomies by parity, education and religion are described. Their prevalence increases with the parity of the wife, has a marked inverse relationship with education, and is highest when neither husband nor wife is Catholic.