Maximum Likelihood Estimation of the Log-Binomial Model

Maximum likelihood estimation of prevalence ratios using the log-binomial model is problematic when the estimates are on the boundary of the parameter space. When the model is correct, maximum likelihood is often the method of choice. The authors provide a theorem, formulas, and methodology for obtaining maximum likelihood estimators of the log-binomial model and their estimated standard errors when the solution is on the boundary of the parameter space. Examples are given to illustrate the method.     

Inference Methods for Correlated Left Truncated Lifetimes: Parent and Offspring Relations in an Adoption Study

The associations in mortality of adult adoptees and their biological or adoptive parents have been studied in order to separate genetic and environmental influences. The 1003 Danish adoptees born 1924–26 have previously been analysed in a Cox regression model, using dichotomised versions of the parents’ lifetimes as covariates. This model will be referred to as the conditional Cox model, as it analyses lifetimes of adoptees conditional on parental lifetimes. Shared frailty models may be more satisfactory by using the entire observed lifetime of the parents. In a simulation study, sample size, distribution of lifetimes, truncation- and censoring patterns were chosen to illustrate aspects of the adoption dataset, and were generated from the conditional Cox model or a shared frailty model with gamma distributed frailties. First, efficiency was compared in the conditional Cox model and a shared frailty model, based on the conditional approach. For data with type 1 censoring the models showed no differences, whereas in data with random or no censoring, the models had different power in favour of the one from which data were generated. Secondly, estimation in the shared frailty model by a conditional approach or a two-stage copula approach was compared. Both approaches worked well, with no sign of dependence upon the truncation pattern, but some sign of bias depending on the censoring. For frailty parameters close to zero, we found bias when the estimation procedure used did not allow negative estimates. Based on this evaluation, we prefer to use frailty models allowing for negative frailty parameter estimates. The conclusions from earlier analyses of the adoption study were confirmed, though without greater precision than using the conditional Cox model. Analyses of associations between parental lifetimes are also presented.     

Social integration and suicide: Denmark, 1906–2006

Research on the relationship between social integration and suicide rates has neglected a historical perspective. Analyses are often based on relatively short time periods where there may not be enough variation in integration to affect the national suicide rate, or where overall integration levels are not low enough to buttress a link between a specific index of low integration, such as divorce, and suicide. The present investigation contributes to the literature by testing a hypothesis on domestic integration and suicide over a century, the longest period studied to date, encompassing periods of low and high overall social integration, and emergent risk and protective factors. Data are available for core variables for Denmark, 1906–2006. Annual data include those on suicide, and indicators of integration (divorces, births, marriages), as well as for economic strain (unemployment) and time trends. A log linear Poisson model is estimated, which explores the central divorce–suicide relationship under controls for confounders. Controlling for confounders, a one percent increase in divorce increases male suicides by 0.52% and female suicides by 1.12%. As anticipated, marriages decrease suicide: a one percent increase in marriages reduces suicide by 0.77% for men and by 0.63% for women. The trend in divorce, in particular, offers accurate predictions of suicide throughout the century. The relationship between divorce and suicide over a century is robust. The results offer the strongest support to date in support of a social integration model based on long term historical data on suicide and divorce.     

“To thine own self be true”: The effects of enactment and life storytelling on perceived leader authenticity

Although researchers have emphasized the importance of antecedents to the construct of authentic leadership, very little empirical research exists to confirm this notion. Combining theoretical approaches from dramaturgy and narrative research, we were able to identify possible antecedents that help followers perceive a leader's authenticity. Using two online experimental designs, we analyzed the concept of perceived leader authenticity. Specifically, we examined how a leader's enactment—that is, a leader's physical actions—(Study 1, n = 105) and a combination of leader enactment and life storytelling (Study 2, n = 334) influenced followers' perceptions of the leader's authenticity, and how this may impact leadership outcomes. The results of these studies, in which leader enactment in the context of authentic leadership was operationalized for the first time, indicate that leader enactment predicts perceived leader authenticity. Life storytelling, however, only partially predicted followers' perceptions of the leader's authenticity. Findings further revealed that followers' trust in the leader and positive emotions are outcomes of perceived leader authenticity. Implications for research and practice are discussed.     

Schools as racialized organizations in policy and practice

In this paper we examine schooling inequalities through drawing from the contributions of racialized organizations. We apply the components of this racial theory to offer a new framework for examining racial inequalities in US K-12 schools. We analyze case studies to demonstrate how the four tenants of racialized organizations operate in three schools. In particular, we highlight how these tenants surface through schools' policies (school rules around discipline, language, and tracking) and practices (interactions between students, teachers and staff). We offer a framework for understanding how schools are shaped by the racial hierarchy at the organizational level. We close by considering implications and suggestions for future research.     

That Teenage Feeling

This article deconstructs news media representations of two custody abductions that took place in Aotearoa New Zealand in the mid-2000s. In the first case, the father abducted his five-month-old daughter; in the second case, the mother was held responsible for the abduction of her six-year-old son even though he was in the presence of his maternal grandfather. The analysis demonstrates that the media's pejorative construction of the mothers at the center of both cases was facilitated by a number of significant gaps and silences in the narration of the abductions. These silences, in lending support to a fathers' rights construction of custody disputes in which mothers are to blame for dispossessing fathers of their children, reveal the media's reliance on pro-father discourses, particularly fathers' rights discourse.     

Der Fragebogen Karls des Grossen

A document compiled by Charlemagne in the year 811 can be viewed as a precursor to the structured survey and thus as a part of the very beginnings of empirical social research. Charlemagne intended to use the list, which resembles a discussion guide employed in an intensive interview, to exert moral pressure on the secular and clerical leaders of his realm, who were gathered for a parliamentary assembly. At the same time, however, it is also evident that at least some of the questions were designed to gather information on the mood of the population throughout the empire. These questions were probably passed on to the sovereigns and clerics in the provinces. Another document from the year 811 would seem to indicate that answers to similar lists of questions did in fact arrive at the emperor’s court. Both documents attest to a means of gathering information that could be viewed as the first attempt to conduct at an opinion survey.     

Community And Commitment Among Catholics: A Test Of Local-Cosmopolitan Theory*

This study tests Roof's (1972,1976,1978) local-cosmopolitan theory of religious commitment using a sample of Catholics living in west Tennessee. Consistent with Roof's theory, local community reference (localism) had significant positive effects on four measures of religious beliefs and played a limited role in mediating the effects of education, size of hometown, and length of residence on these measures. However, localism had inconsequential effects on four behavioral measures of religiosity. Possible explanations for these findings and implications they have for the generalizability of the theory are discussed.