Hypothesis testing, power and sample size determination for between group comparisons in fMRI experiments

Modern methods for imaging the human brain, such as functional magnetic resonance imaging (fMRI) present a range of challenging statistical problems. In this paper, we first develop a large sample based test for between group comparisons and use it to determine the necessary sample size in order to obtain a target power via simulation under various alternatives for a given pre-specified significance level. Both testing and sample size calculations are particularly critical for neuroscientists who use these new techniques, since each subject is expensive to image.     

Prompts,Not Questions: Four Techniques for Crafting Better Interview Protocols

Qualitative Sociology - We offer effective ways to write interview protocol “prompts” that are generative of the most critical types of information researchers wish to learn from...     

Social work education and political conflict: preparing students to address the needs of victims and survivors of the Troubles in Northern Ireland

This paper reports on the evaluation of a European PEACE III sponsored teaching and learning project that was designed to enable social work students to better understand the needs of victims and survivors of the conflict in Northern Ireland. The paper begins with an introduction to policy, practice and educational contexts before reviewing the literature on social work, conflict and trauma. It also summarises key, innovative pedagogical approaches used in the teaching, including the use of ground rules, teaching teams consisting of lecturer and service user dyads, learning exercises and case studies. The paper then explains the evaluation methodology. This involved two surveys which returned 144 student and 34 practice teacher questionnaires. The findings revealed that students were generally committed to this form of teaching and engagement with victims and survivors of the conflict, although some students reported that their attitudes towards this subject had were not changed. Some students also discussed how the conflict had affected their lives and the lives of families and friends; it is argued that such biographical details are crucial in developing new pedagogical approaches in this area. Practice teachers who supervised some of these students on placement reported general levels of satisfaction with preparedness to work with conflict related situations but were less convinced that organisations were so committed. The paper concludes with a discussion of the study limitations and a recommendation for more robust methods of teaching and evaluation in this area of social work education and practice.     

Public/Private Pension Mix,Income Inequality and Poverty among the Elderly in Europe: An Empirical Analysis Using New and Revised OECD Data

Prior studies have suggested that higher public pensions are associated with lower income inequality among the elderly, whereas the reverse is true for private pensions. Van Vliet et al. ( 2012 ) empirically test whether relative shifts from public to private pension schemes entail higher levels of income inequality among the elderly using panel data from the OECD SOCX and the EU‐SILC databases. Contrasting earlier empirical studies using either cross‐sectional or time‐series data, they do not find evidence that shifts from public to private pension provision are associated with higher levels of income inequality or poverty among the elderly. The aim of the current article is to extend the analysis of Van Vliet et al. by: (1) adding additional countries; (2) adding additionally available years; and (3) using revised OECD SOCX data. In contrast to Van Vliet et al., we find that a greater relative importance of private pensions is associated with higher levels of income inequality and poverty among the elderly. A central explanation of the difference in conclusions stems from the revision of OECD SOCX data.     

An integrated and experience-based approach to social work education: The Newcastle model

This paper describes a unique social work education model developed by a group of social work practitioners, all but one of whom were new to academia. The University of Newcastle, in New South Wales, pioneered problem-based learning (PBL) in Australia. The social work programme adopted PBL and gave it a strengths focus, making experience and experiential learning central to its approach. Newcastle's model is based on the belief that learning to be good social workers is best achieved through learning by doing, working with students' experiences, integrating theory and practice, using a collaborative or small group approach, and locating these elements in a strong social justice context. The Bachelor of Social Work (BSW) degree is relatively new. Introduced in 1991, its first graduates entered the workforce in 1995. The Newcastle model provides a unique example of experience-based learning and an integrated approach to social work education.     

Life Events and Sexual Risk Among HIV-Negative,Heterosexual, Methamphetamine Users

Identifying psychosocial factors associated with sexual risk behavior among methamphetamine users is essential to enhancing HIV and sexually transmitted infection prevention. This study examined the relationship between positive and negative life events and sexual risk behavior in a sample of 100 HIV-negative, heterosexually identified, methamphetamine-using men and women. Negative life event categories included death of a significant other, negative health event involving self or significant other, and child custody or visitation issues. Categories of positive life events included birth or pregnancy involving self or significant other, a positive relationship event, and a positive life change. Multivariate analyses demonstrated that negative life events were positively associated with total number of unprotected sex acts, whereas positive life events were not associated with sexual risk taking. Also, amount of methamphetamine used did not moderate the relationship between life events and sexual risk behavior. These data support future research to identify underlying mechanisms that link negative life events to sexual risk taking in this high-risk population.