Best linear unbiased estimates in ranked-set sampling with particular reference to imperfect ordering

SUMMARY Ranked-set sampling is a widely used sampling procedure when sample observations are expensive or difficult to obtain. It departs from simple random sampling by seeking to spread the observations in the sample widely over the distribution or population. This is achieved by ranking methods which may need to employ concomitant information. The ranked-set sample mean is known to be more efficient than the corresponding simple random sample mean. Instead of the ranked-set sample mean, this paper considers the corresponding optimal estimator: the ranked-set best linear unbiased estimator. This is shown to be more efficient, even for normal data, but particularly for skew data, such as from an exponential distribution. The corresponding forms of the estimators are quite distinct from the ranked-set sample mean. Improvement holds where the ordering is perfect or imperfect, with this prospect of improper ordering being explored through the use of concomitants. In addition, the corresponding optimal linear estimator of a scale parameter is also discussed. The results are applied to a biological problem that involves the estimation of root weights for experimental plants, where the expense of measurement implies the need to minimize the number of observations taken.     

Supervision in Family Therapy: A Developmental Perspective

A group model of supervision of family therapy was implemented by a team of three supervisors with doctoral students in counseling psychology. It was believed that such an approach would provide students with more opportunity to work as therapists with families and to observe a greater variety of families, therapists, and therapeutic styles than in other models. Interchange in supervisory sessions focused on co-therapy issues, observation skills, family dynamics, differing therapeutic techniques and approaches, and planning and goal setting in therapy. This experience contributed to the professional and personal growth and development of students.     

Risk Perception and Technological Development at a Societal Level

This article tests the hypothesis that the exposure to the threat to societies posed by the introduction of new technologies is associated with a normalization of risk perception. Data collected in 2000 by the International Social Survey Programme (ISSP) on environmental issues were used to explore this hypothesis. Representative samples from 25 countries were employed to assess the national levels of perceived threat to the environment associated with a series of technologies and activities. These values were correlated with economic indicators (mainly from the World Bank) of the diffusion of each of the technologies or activities in each country. Results indicate a negative association of risk perception with the level of technological prevalence (societal normalization effect) and a positive association with the rate of growth of the technology (societal sensitivity effect). These results indicate that the most acute levels of perceived environmental risk are found in those countries where the level of technological prevalence is low but where there has recently been substantial technological development. Environmental awareness is a mediator of the relationship between risk perception and the indices of technological diffusion. This result means that: (1) societal normalization of risk is not a direct consequence of prevalence of the technology, but is driven by awareness of technological development and that (2) societal sensitivity to risk is associated with lower levels of environmental awareness.     

Lesbian Parenting: Insiders' Voices

Lesbian parenting has entered the public arena over recent years via debates regarding access to fertility services and adoption, legal recognition of same‐sex parents and children's rights (McNair, 2002). Research in the area has been published for over 20 years, with an increasing shift towards delineating diversity rather than proving the legitimacy of these families. The ANZJFT — the major mouthpiece for Australian family therapists — has made curiously little contribution to the literature on lesbian parenting. The lack of discussion leaves trainees and family therapists largely ignorant about the lived experience of lesbian family life. This paper goes some way to filling this gap. We present data gathered from 151 Australian lesbian parents who answered questions about their own and their families' perceived strengths. Despite the constraints and challenges of living within a heteronormative and homophobic society and dealing with discrimination and legal, political and social non‐legitimation, this group of lesbian parents expressed great pride in raising well‐adjusted and happy children. They also described their families as thoughtfully planned, proud, accepting and celebratory of diversity and difference, flexible in gender roles, and as having interesting, supportive, extended kinship networks that included a wide range of positive role models for their children.     

THE SOCIAL CONTEXT OF RELIGIOUS INTEGRATION AND SUICIDE:

Recent research suggests that Durkheimian ideas on the impact of religious affiliation on suicide need to be updated and tailored to the modern cultural landscape of the United States. Following up on the importance of how historical context has shifted the integrative power of denominational networks, this article pursues the potential utility of a networks, perspective by suggesting that a significant contextual element has been neglected to date: Geographical context, both regional and rural-urban dimensions, also delimits the differential ability of religions to form a "community' of social support capable of integrating individuals. If the network approach provides a useful direction, the effects of religious affiliation across geographical areas should vary in a manner consistent with notions of how social structural opportunity and tradition (of lack thereof) affect religious network strength. Analyses of detailed suicide, religion, and sociodemographic data by region and population density in U.S. county groups do, in fact, indicate that for many major religious groups the effects of religious affiliation on suicide vary across geographical areas, consistent with network theory. For example, while Judaism's protective effect is small overall, it is large in the Northeast and reversed in the South. The protective strength also is reversed for Catholicism in the South and many Evangelical Protestant groups in the Northeast. Overall, the results suggest that region exerts a greater impact on religious affiliation effects than does population density, though the latter does impact on Catholic and Jewish effects.     

U. S. population growth as an abstractly-perceived problem

Recent public opinion polls report that a majority of Americans consider the nation’s population growth rate to be a “serious” problem. Little systematic evidence exists on whether they view the problem as a factor that the individual married couple should consider in deciding on family size. A survey of 134 adult women living in a limited-income family housing project in a relatively small and isolated American community suggests: the view that continued population growth is a problem in the United States is endorsed more strongly than the view that the couple has a responsibility to limit its fertility because of overpopulation; and concern with population growth is only loosely associated with acceptance of the individual responsibility attitude. Among subgroups of respondents, Catholics were more likely to hold a negative attitude toward population growth than to possess the individual responsibility view and they exhibited a correlation between the two attitudes. Protestants were distinguished by no difference in or correlation between the acceptance of the two attitudes. A correlation between the attitudes was especially pronounced among Catholics with high achievement values. It is suggested that measures explicitly intended to control population growth probably cannot be adopted until there is a strong correlation between the two attitudes.     

Volunteering to Assist the Homeless: Public Service and Individual Differences

Abstract

The present investigation examined the effects of three public service announcements (PSAs) on undergraduates’ willingness to volunteer to assist the homeless at a local emergency shelter. A PSA designed to arouse empathy in listeners generally yielded a higher rate of volunteering to assist the homeless than either a self-oriented PSA or an unemotional, other-oriented PSA. The PSA designed to arouse empathy was found to be especially effective in promoting volunteering in individuals who scored relatively high on trait affective empathy and who, in turn, reported a relatively strong empathic response to this message.     

Adolescents and their networks of social support: real connections in real lives?

Social support is widely seen as an integral component for coping with the stresses of everyday life. While there are various sources and types of support potentially available to young people, it is perhaps less obvious the extent to which young people differentially experience these sources and types. Anecdotal evidence suggests that context, culture and other factors unique to local life shape the many dimensions of social support for youth. In this paper, we seek to examine this research need in more detail by focusing on a broad range of factors shaping youth social support and youth well‐being. Drawing on mixed methods research, we examine social support evidence for adolescents in Florida, USA, and Offaly, Ireland. Through this research, we investigate how the connection between social support and well‐being bears out in these two different socio‐cultural contexts; second, we seek to understand whether types and sources of social support differ among youth in both countries; and what relationship exists between well‐being and types and sources of support. Comparing similar measures of social support across two distinct societal contexts allows us to determine similarities and differences, while also providing suggestions for application that can shape future programmes and policy.