Bivariate prior distributions via branching exchangeable sequences

This paper provides a novel approach to constructing bivariate prior distributions. The idea is based on the notion of partial exchangeability. In particular, in a simple extension of the exchangeable sequence, we create two dependent exchangeable sequences via a branching mechanism. This implies the existence of a bivariate prior distribution.     

Nano Risk Analysis: Advancing the Science for Nanomaterials Risk Management

Scientists, activists, industry, and governments have raised concerns about health and environmental risks of nanoscale materials. The Society for Risk Analysis convened experts in September 2008 in Washington, DC to deliberate on issues relating to the unique attributes of nanoscale materials that raise novel concerns about health risks. This article reports on the overall themes and findings of the workshop, uncovering the underlying issues for each of these topics that become recurring themes. The attributes of nanoscale particles and other nanomaterials that present novel issues for risk analysis are evaluated in a risk analysis framework, identifying challenges and opportunities for risk analysts and others seeking to assess and manage the risks from emerging nanoscale materials and nanotechnologies. Workshop deliberations and recommendations for advancing the risk analysis and management of nanotechnologies are presented.     

A brief research note: helplessness, hopelessness, and haplessness as predictors of suicidal ideation: a cross-cultural study

Scales to measure helplessness and hopelessness were found to have good reliability and were significantly correlated with suicidal ideation in both Turkish and American respondents.     

College student bereavement experience in a Christian university

As part of the National College Grief Study, college student bereavement experience was examined specifically in a Christian university climate. Sex, year in school, and closeness to the deceased were measured in terms of academic and mental health outcomes and resources utilized. Females reported more mental health problems when close to the deceased, and seniors were less likely than first year students to utilize personal support resources of family and religion. During close losses, students experienced more mental health problems and negative social outcomes, but they did not access more resources. Recommendations for university personnel and suggestions for further research are given.     

Issues in the design and analysis of therapeutic trials in human immunodeficiency virus infection

The first randomized trial of antiviral therapy in human immunodeficiency virus (HIV) disease included 282 patients with acquired immune deficiency syndrome (AIDS) or AIDS-related complex and was stopped in 1986 after an average follow-up of 4 months because of a substantial reduction in mortality in the group who received zidovudine (AZT). The era of anti-HIV treatment had begun. This paper discusses some of the difficulties which have emerged over the subsequent 10 years as new anti-HIV drugs have been developed requiring evaluation in clinical trials. The trials in which the British Medical Research Council has played a major role (the Concorde, Alpha and Delta trials) and some of the key trials conducted by the AIDS Clinical Trials Group (ACTG) (the ACTG 019 and ACTG 175 trials) and the Community Programs for Clinical Research on AIDS (CPCRA) (the CPCRA 007 trial) in the US will be used to illustrate some of the issues faced by clinical trialists and governmental regulatory agencies in the evaluation of therapies for a disease which, in spite of advances in therapy, still has a high mortality.     

When disaster strikes. The concerns of staff nurses

1. This study determined how involvement with an earthquake affected patient care delivery and ascertained what nurses need to continue providing safe and efficient care in future disasters. 2. Although 60% of the staff had experienced a previous disaster, the literature described that learned coping does not automatically "transfer" to present loss experiences. 3. Providing staff with debriefing sessions and other support groups is helpful in the post-trauma period. At all levels, there is a need to communicate concerns and to be involved in disaster drills and other disaster preparedness sessions.     

Parent–child joint media engagement in infancy

Early conversations are an important source in shaping children's cognitive and emotional development, and it is vital to understand how parents use media as a platform to engage in conversations with their young children and what might predict the quality of these interactions. Thus, in the current study we explored the nature of parent–child discourse while engaging in media (i.e., joint media engagement) with infants, and how parent (empathic concern and responsiveness) and child (negative emotionality and regulatory capacity) variables might be associated with the quality of engagement. The current study consisted of 269 infants (50% female, M_age = 17.09 months, SD = 3.93; 59% White) and their primary caregiver (98% mothers) who engaged in a variety of in‐home tasks and parental questionnaires. Results established three meaningful codes for both parent and child that assessed positive and negative joint media engagement. Further, results suggested that parental empathic concern was associated with positive parent and child media engagement, while child negative emotionality was associated with lower levels of distraction. Discussion focuses on the importance of studying parent–child discourse in the context of joint media engagement and recommends limiting media exposure before 18 months of age.