Zero-inflated sum of Conway-Maxwell-Poissons (ZISCMP) regression

While excess zeros are often thought to cause data over-dispersion (i.e. when the variance exceeds the mean), this implication is not absolute. One should instead consider a flexible class of distributions that can address data dispersion along with excess zeros. This work develops a zero-inflated sum-of-Conway-Maxwell-Poissons (ZISCMP) regression as a flexible analysis tool to model count data that express significant data dispersion and contain excess zeros. This class of models contains several special case zero-inflated regressions, including zero-inflated Poisson (ZIP), zero-inflated negative binomial (ZINB), zero-inflated binomial (ZIB), and the zero-inflated Conway-Maxwell-Poisson (ZICMP). Through simulated and real data examples, we demonstrate class flexibility and usefulness. We further utilize it to analyze shark species data from Australia's Great Barrier Reef to assess the environmental impact of human action on the number of various species of sharks.     

Racial identity, racial discrimination, perceived stress, and psychological distress among African American young adults

This study examines the direct and indirect relationships among racial identity, racial discrimination, perceived stress, and psychological distress in a sample of 555 African American young adults. A prospective study design was used to assess the influence of two dimensions of racial identity attitudes (i.e., centrality and public regard) on other study variables to investigate the relationship between racial identity attitudes and psychological distress. The results show some evidence of a direct relationship between racial centrality and psychological distress, as well as evidence of indirect relationships for both centrality and public regard through the impact of racial discrimination and perceived stress. In addition, racial centrality was both a risk factor for experiencing discrimination and a protective factor in buffering the negative impact of discrimination on psychological distress. Results are discussed within the context of identifying multiple pathways to psychological well-being for African American young adults within the context of racial discrimination.     

Medical ethics and the civil rights movement. Why informed consent is too little, too late.

Medical ethics is viewed as one phase of the human rights movement begun by blacks in the 1950s and then continued by feminists, consumerists, and bioethicists.     

Shorter hours wanted? A systematic review of working-time preferences and outcomes

Changes in working time have important economic, social and environmental implications. However, research on workers' preferences is highly fragmented across disciplines and journals. To overcome this, the present article provides a systematic review of the literature, analysing 173 studies. The study shows that working-time outcomes and mismatches are mostly studied in a small group of OECD countries, using survey data and statistical methods. The most clear and consistent results are about gender, care responsibilities and current working hours. Among professions, only the medical workforce receives substantial attention. Norms and preference formation are poorly understood, and more qualitative research is essential to understand how working-time reductions could spread.     

Reality check. Evaluating a school-based gang prevention model

The Gang Resistance Education and Training (G.R.E.A.T.) program is a school-based gang prevention initiative developed in 1991 through the collaborative efforts of the Bureau of Alcohol, Tobacco, and Firearms, the Federal Law Enforcement Training Center, and the Phoenix Police Department. Uniformed law enforcement officers, certified as G.R.E.A.T. instructors, teach the 9-week curriculum to middle students. In 1994, the National Institute of Justice funded a national evaluation of the G.R.E.A.T. program. The process evaluation component of this larger study is reported. First, results of on-site observations of the G.R.E.A.T. Officer Training program, including an overview of the training activities, and the authors' assessment of the training process are reported. Second, observations of the implementation of the program by officers at six sites are reported. Of primary concern was whether the program delivered to students was similar to the program taught to the officers during the G.R.E.A.T. Officer Training.     

Developmental Characteristics of African American and Caribbean Black Adolescents' Attributions Regarding Discrimination

The present study examined discrimination attributions in the psychological well‐being of Black adolescents. Findings are based on a representative sample of 810 African American and 360 Caribbean Black youth, aged 13–17, who participated in the National Survey of American Life. Youth completed measures of perceived discrimination, discrimination attributions, depressive symptoms, self‐esteem, and life satisfaction. Approximately half the youth attributed discrimination to race/ethnicity (43%), followed by age (17%), physical appearance (16.5%), and gender (7.5%), and there were no ethnic, gender, or age differences regarding discrimination attributions. Key findings suggest that the association between perceived discrimination and psychological well‐being did not vary according to discrimination attribution, which implies that discrimination is harmful for Black youth regardless of the attribution.     

Globalization and Free Trade Agreements: A Profile of a Nicaraguan Factory Community

This study examines a Nicaraguan community 3 years after the signing of the Dominican Republic-Central American Free Trade Agreement (CAFTA). Qualitative and quantitative methods were used to learn how families, living in a community constructed near a US-owned factory, maintained resilience under growing negative conditions. These conditions relate to family dislocation, loss of support systems, lack of childcare, safe water, and food security, in addition to labor injustices. Although maintaining relatively high scores on a baseline resilience test, these families and others like them in Central America, demonstrate a struggle for survival in a globalized context.     

Using process data to explain outcomes. An illustration from the Child and Adolescent Trial for Cardiovascular Health (CATCH)

The purpose of this article is to illustrate the use of process evaluation for understanding study outcomes. Data from the Child and Adolescent Trial for Cardiovascular Health (CATCH), a large school-based field trial, are used. Teacher characteristics, measures of classroom curriculum implementation, and competing influences are linked to changes in dietary knowledge, intentions, and self-efficacy of students in the intervention schools. Multiple regression analyses indicate that teacher characteristics did not predict program implementation. Teacher characteristics and program fidelity, or the number of modifications made to the classroom curriculum during implementation, had direct and independent effects on student outcomes.