Using a Box–Cox transformation in the analysis of longitudinal data with incomplete responses

We analyse longitudinal data on CD4 cell counts from patients who participated in clinical trials that compared two therapeutic treatments: zidovudine and didanosine. The investigators were interested in modelling the CD4 cell count as a function of treatment, age at base-line and disease stage at base-line. Serious concerns can be raised about the normality assumption of CD4 cell counts that is implicit in many methods and therefore an analysis may have to start with a transformation. Instead of assuming that we know the transformation (e.g. logarithmic) that makes the outcome normal and linearly related to the covariates, we estimate the transformation, by using maximum likelihood, within the Box–Cox family. There has been considerable work on the Box–Cox transformation for univariate regression models. Here, we discuss the Box–Cox transformation for longitudinal regression models when the outcome can be missing over time, and we also implement a maximization method for the likelihood, assumming that the missing data are missing at random.     

REGION, RELIGIOUS COMMITMENT, AND LIFE SATISFACTION AMONG BLACK AMERICANS

Using data from the National Survey of Black Americans (NSBA), this research examines three sets of hypotheses regarding the effects of religious commitment on life satisfaction. Further, given evidence of historical geographical differences in black culture and social structure, this study explores the regional specificity of religious influences on life satisfaction. Religious participation contributes to subjective well-being only among non-southern blacks, while private religiosity is unrelated to well-being in any analysis. There are also denominational effects: non-southern members of traditional black denominations (i.e., Baptists and Methodists) and southern Catholics report particularly high levels of life satisfaction. In addition, the effects of religion on life satisfaction are contingent upon age for non-southerners only. This study concludes with a discussion of directions for future research on religion and mental health.     

The Effects of Perceived Barriers,Role Models,and Acculturation on the Career Self‐Efficacy and Career Consideration of Hispanic Women

This study used path analysis to examine the relationship between perceived barriers, acculturation, and role model influence on the career self‐efficacy and career considerations of a sample of Hispanic women. Two path models were examined. The male‐dominated model accounted for 15% of the variance, and the female‐dominated model accounted for 26% of the variance. No relationship was found between the variables of interest and male‐dominated career self‐efficacy and consideration. However, perceived barriers were related to female‐dominated career consideration and Anglo acculturation significantly contributed to female‐dominated career self‐efficacy. Results are discussed with regard to career practice and research with Hispanic women.     

Mixing patterns between age groups in social networks

We present a method for estimating transmission matrices that describe the mixing and the probability of infection between age groups. Transmission matrices can be used to estimate age-dependent forces of infection in age-structured, compartmental models for the study of infectious diseases. We analyze the social network generated by the synthetic population of Portland and extract mixing patterns. Our results show that the mixing within the population consists of two groups, children and adults. Children interact most frequently with other children close to their own age, while adults interact with a wider range of age groups and the durations of typical adult contacts are shorter than typical contacts between children. Furthermore, the transmission matrix shows that children are more likely to acquire infection than adults.     

Myths and Moral Authority in Maluku: The Case of Ambon

Since January 1999, the island of Ambon, located in the province of Maluku (Moluccas) in Eastern Indonesia, has been the scene of a virtual war between Christians and Muslims. Amid its religious underpinnings, two competing nationalistic ideologies have developed, one based on allegiance to an ethnic Moluccan nation and the other to a civic nation of common residence. Attempts to rationalise the underlying sentiment of the masses in these movements have purported rational explanations of the pursuit of common material interests, while others have focused on innate emotions of individual loyalty to their community. The other explanation suggests that identity is constructed as an ideological myth that convinces the individual of the simplicity of otherwise complex situations. In this respect, this paper has focused on the psychological and political appeal of myths of kinship as strengthening ideas of national consciousness and individual loyalty. It is asserted that the construction of new 'us' and 'them' visions of imagined community occur in the context of social, economic and political processes. These disruptive forces place individuals in stress situations and make them susceptible to these ideologies which offer simplistic diagnoses of complex social and political changes.     

Suicide prevention and intervention with young people in foster care in Canada

Given the history of turmoil in their lives, foster children and young people coming into care are particularly at risk of suicide. Whether a crisis is successfully prevented, or treated and transcended, depends upon the ability of foster parents and agency staff members to understand the nature of the situation and to work together in dealing with it.     

Practice and Research in Career Counseling and Development—2002

The authors present a review of the 2002 career development literature. The literature review is divided into the following areas: career theory, career assessment, career counseling interventions and practice, career counseling training and professional issues, and international issues in career counseling. The authors discuss the implications of the findings in this literature for career counseling practice.     

Determinants of executive compensation in small business development centers

We develop and test a model of nonprofit executive compensation based on theories of organizational science, economics, and agency theory. Our sample consisted of 114 directors of small business development centers in the United States. Consistent with our model, we find significant effects for human capital, organizational size, and organizational affiliation. We find tentative support for a significant pay‐for‐performance relationship. We find that when education, tenure, size, performance, and affiliation are held constant, female executives are compensated significantly less than male executives.     

Bayesian methods for generalized linear models with covariates missing at random

The authors propose methods for Bayesian inference for generalized linear models with missing covariate data. They specify a parametric distribution for the covariates that is written as a sequence of one‐dimensional conditional distributions. They propose an informative class of joint prior distributions for the regression coefficients and the parameters arising from the covariate distributions. They examine the properties of the proposed prior and resulting posterior distributions. They also present a Bayesian criterion for comparing various models, and a calibration is derived for it. A detailed simulation is conducted and two real data sets are examined to demonstrate the methodology.