Estimation of dependence between paired correlated failure times in the presence of covariate measurement error

Summary. In many biomedical studies, covariates are subject to measurement error. Although it is well known that the regression coefficients estimators can be substantially biased if the measurement error is not accommodated, there has been little study of the effect of covariate measurement error on the estimation of the dependence between bivariate failure times. We show that the dependence parameter estimator in the Clayton–Oakes model can be considerably biased if the measurement error in the covariate is not accommodated. In contrast with the typical bias towards the null for marginal regression coefficients, the dependence parameter can be biased in either direction. We introduce a bias reduction technique for the bivariate survival function in copula models while assuming an additive measurement error model and replicated measurement for the covariates, and we study the large and small sample properties of the dependence parameter estimator proposed.     

What are Social Work Students’ Perceptions of the Community Practice Method?

Summary. A unique aspect of the social work profession is the combination of intervention on the personal, community, and societal levels and their interaction. The purpose of this research is to determine students’ perceptions of community practice. Qualitative research was conducted among Israeli social work students before gaining any practical experience in community practice. Findings. The results demonstrated a change in students’ perceptions of the importance of community practice to the profession, and the factors that contributed to this change. Applications. Recommendations that may contribute to changing students’ perceptions of community practice are offered to educators.     

“Lost Childhood”—Lessons from the Holocaust: Implications for Adult Adjustment

This paper was written in memoriam to the one and a half million children murdered during the Holocaust; in celebration of the tiny percentage who survived; in honor of their rescuers, the Righteous Christians and in meeting our own responsibility as survivors to bear witness.     

High School Reunions and the Management of Identity

Organized around an intersection of the past with the present, high school reunions confront those who attend with discontinuities in their own lives as well as the lives of others. Based on observations of and interviews with attendees at five reunions, we argue, contrary to many claims about the contemporary segmentation of the self, that reunion goers are able to construct accounts of coherent lives by reference to “true selves” independent of appearances. Although reunion attendees may attempt to manage impressions by controlling information about themselves, these efforts are limited by attendees efforts to sustain convictions of their own integrity. These convictions, however, also depend on accounts, albeit accounts directed inward. Moreover, the maintenance of this conviction depends on the successful “neutralization” of others' judgments.     

The Effect of Occupational Sex Composition on the Gender Gap in Workplace Authority

This article compares women and men's attainment of workplace authority in female-dominated, mixed, and male-dominated occupations. It is based on a representative mobility study of Jewish women in the Israeli labor force conducted in 1991–1992. Two sets of hypotheses are offered based on two competing theories. The first theory predicts that in female occupations women have more influence and mutual support than in male occupations, and, hence, they will have more access to authority. The opposing perspective argues that in male-dominated occupations the competition between women and men is weaker, and therefore men have a smaller incentive to discriminate against women. Our findings support the second argument. The gender gap in authority is larger in female-dominated occupations, and women have the highest chances to have authority when they work in male occupations; men have similar chances, no matter in which type of occupation they are employed.     

Social, Economic, and Attitudinal Characteristics of Cohabitation in Israel

This article examines cohabitation in Israel. Since the 1980s cohabitation has been on the rise, with heterosexual couples living together without being legally married. The purpose of this article is to address the following questions: What are the characteristics of cohabitation; what economic circumstances affect cohabitation; why is cohabitation chosen over “family” and is it becoming a threat to the family institution? The sample consisted of 50 couples. Our major findings were that cohabitation does not seem to be an alternative to marriage, but a prelude to it. We found a high correlation between the cohabitants' willingness to marry and their willingness to have children in the future. Cohabitants live in rented apartments, usually do not share a bank account, and have no formal economic agreement.     

Factors Affecting Juvenile Court Decisions in Israel: A Multivariate Approach*

This paper investigates the factors influencing the disposition of cases in juvenile courts. The factors considered are the prior record of the offender, the nature of the offense, the recommendation of the probation officer, and the age of the offender. These four factors are essential components of the juvenile justice system and as such are perceived to be crucial for the understanding of the court's decision. A multivariate analysis of the data is undertaken using the method of log-linear analysis for hierarchical models. In contrast to other studies that have utilized the same method but with fewer variables, the model arrived at in the paper seems to be more accurate and suggests that while the offense and the prior criminal record are quite important factors, their influence on the disposition of cases is greatly bound by the age of the offender and the recommendation of the probation officer.     

Calibrated predictions for multivariate competing risks models

Prediction models for time-to-event data play a prominent role in assessing the individual risk of a disease, such as cancer. Accurate disease prediction models provide an efficient tool for identifying individuals at high risk, and provide the groundwork for estimating the population burden and cost of disease and for developing patient care guidelines. We focus on risk prediction of a disease in which family history is an important risk factor that reflects inherited genetic susceptibility, shared environment, and common behavior patterns. In this work family history is accommodated using frailty models, with the main novel feature being allowing for competing risks, such as other diseases or mortality. We show through a simulation study that naively treating competing risks as independent right censoring events results in non-calibrated predictions, with the expected number of events overestimated. Discrimination performance is not affected by ignoring competing risks. Our proposed prediction methodologies correctly account for competing events, are very well calibrated, and easy to implement.     

The Association of Knowledge with Concern About Global Warming: Trusted Information Sources Shape Public Thinking

During the last decade, a great deal of news media attention has focused on informing the American public about scientific findings on global warming (GW). Has learning this sort of information led the American public to become more concerned about GW? Using data from two surveys of nationally representative samples of American adults, this article shows that the relation between self‐reported knowledge and concern about GW is more complex than what previous research has suggested. Among people who trust scientists to provide reliable information about the environment and among Democrats and Independents, increased knowledge has been associated with increased concern. But among people who are skeptical about scientists and among Republicans more knowledge was generally not associated with greater concern. The association of knowledge with concern among Democrats and Independents who trust scientists was mediated by perceptions of consensus among scientists about GW's existence and by perceptions that humans are a principal cause of GW. Moreover, additional analyses of panel survey data produced findings consistent with the notion that more knowledge yields more concern among Democrats and Independents, but not among Republicans. Thus, when studying the relation of knowledge and concern, it is important to take into account the content of the information that different types of people acquire and choose to rely upon.     

Smartphones and young publics: A new challenge for public relations practice and relationship building

This study focuses on smartphones and their potential contribution to relationship building, between organizations and young publics. A survey among a representative sample of 550 young, Israelis, aged 21–31, and sixty personal in-depth interviews with undergraduate students were, conducted. The findings reveal that the smartphone satisfies both interaction-related and cognitive-related, needs, but organizations do not utilize the dialogic potential of the smartphone to engage and, to build relationships with young publics.